Well, my preference would be for this simple mod:
Phoenix PX-9TC
Mass: 50 tons
Tech Base: Inner Sphere
Chassis Config: Biped
Rules Level: Experimental Tech
Era: Clan Invasion
Tech Rating/Era Availability: E/X-X-E-A
Production Year: 3070
Cost: 10 248 000 C-Bills
Battle Value: 1 972
Chassis: Unknown Endo-Steel
Power Plant: Unknown 300 Fusion XL Engine
Walking Speed: 64,8 km/h
Maximum Speed: 97,2 km/h
Jump Jets: Unknown
Jump Capacity: 180 meters
Armor: Unknown Standard Armor
Armament:
1 ER PPC + PPC Capacitor
4 ER Medium Lasers
Manufacturer: Unknown
Primary Factory: Unknown
Communications System: Unknown
Targeting and Tracking System: Unknown
================================================================================
Equipment Type Rating Mass
--------------------------------------------------------------------------------
Internal Structure: Endo-Steel 83 points 2,50
Internal Locations: 4 RT, 6 LA, 2 LL, 2 RL
Engine: XL Fusion Engine 300 9,50
Walking MP: 6
Running MP: 9
Jumping MP: 6 Standard
Jump Jet Locations: 2 CT, 2 LT, 2 RT 3,00
Heat Sinks: Double Heat Sink 14(28) 4,00
Heat Sink Locations: 1 RT, 1 RA
Gyro: Standard 3,00
Cockpit: Standard 3,00
Actuators: L: SH+UA+LA+H R: SH+UA+LA+H
Armor: Standard Armor AV - 160 10,00
Internal Armor
Structure Factor
Head 3 9
Center Torso 16 25
Center Torso (rear) 6
L/R Torso 12 20
L/R Torso (rear) 4
L/R Arm 8 16
L/R Leg 12 20
================================================================================
Equipment Location Heat Critical Mass
--------------------------------------------------------------------------------
4 ER Medium Lasers LT 20 4 4,00
Targeting Computer LT - 3 3,00
ER PPC + PPC Capacitor RA 20 3 7,00
ER PPC + PPC Capacitor RA 5* 1 1,00
Free Critical Slots: 4
BattleForce Statistics
MV S (+0) M (+2) L (+4) E (+6) Wt. Ov Armor: 5 Points: 20
6j 3 3 1 0 2 1 Structure: 2
Special Abilities: ENE, SRCH, ES, SEAL, SOA
LFE works too, thought now the heat dissipation starts dropping...
Phoenix PX-9L
Mass: 50 tons
Tech Base: Inner Sphere
Chassis Config: Biped
Rules Level: Experimental Tech
Era: Clan Invasion
Tech Rating/Era Availability: E/X-X-E-A
Production Year: 3070
Cost: 8 804 250 C-Bills
Battle Value: 1 766
Chassis: Unknown Endo-Steel
Power Plant: Unknown 300 Light Fusion Engine
Walking Speed: 64,8 km/h
Maximum Speed: 97,2 km/h
Jump Jets: Unknown
Jump Capacity: 180 meters
Armor: Unknown Ferro-Fibrous
Armament:
1 ER PPC + PPC Capacitor
4 ER Medium Lasers
Manufacturer: Unknown
Primary Factory: Unknown
Communications System: Unknown
Targeting and Tracking System: Unknown
================================================================================
Equipment Type Rating Mass
--------------------------------------------------------------------------------
Internal Structure: Endo-Steel 83 points 2,50
Internal Locations: 5 RT, 5 LA, 2 LL, 2 RL
Engine: Light Fusion Engine 300 14,50
Walking MP: 6
Running MP: 9
Jumping MP: 6 Standard
Jump Jet Locations: 2 CT, 2 LT, 2 RT 3,00
Heat Sinks: Double Heat Sink 13(26) 3,00
Heat Sink Locations: 1 RT
Gyro: Standard 3,00
Cockpit: Standard 3,00
Actuators: L: SH+UA+LA+H R: SH+UA
Armor: Ferro-Fibrous AV - 161 9,00
Armor Locations: 1 HD, 4 LT, 3 LA, 6 RA
Internal Armor
Structure Factor
Head 3 9
Center Torso 16 25
Center Torso (rear) 7
L/R Torso 12 20
L/R Torso (rear) 4
L/R Arm 8 16
L/R Leg 12 20
================================================================================
Equipment Location Heat Critical Mass
--------------------------------------------------------------------------------
4 ER Medium Lasers LT 20 4 4,00
ER PPC + PPC Capacitor RA 20 3 7,00
ER PPC + PPC Capacitor RA 5* 1 1,00
Free Critical Slots: 0
BattleForce Statistics
MV S (+0) M (+2) L (+4) E (+6) Wt. Ov Armor: 5 Points: 18
6j 2 2 1 0 2 1 Structure: 3
Special Abilities: ENE, SRCH, ES, SEAL, SOA
And Stealth is actually sort-of doable too. You're going to have to be VERY careful on the trigger, thought!
Phoenix PX-9S
Mass: 50 tons
Tech Base: Inner Sphere
Chassis Config: Biped
Rules Level: Experimental Tech
Era: Clan Invasion
Tech Rating/Era Availability: E/X-X-F-A
Production Year: 3070
Cost: 11 223 000 C-Bills
Battle Value: 1 794
Chassis: Unknown Endo-Composite
Power Plant: Unknown 300 Fusion XL Engine
Walking Speed: 64,8 km/h
Maximum Speed: 97,2 km/h
Jump Jets: Unknown
Jump Capacity: 180 meters
Armor: Unknown Stealth Armor
Armament:
1 ER PPC + PPC Capacitor
4 ER Medium Lasers
1 Guardian ECM Suite
Manufacturer: Unknown
Primary Factory: Unknown
Communications System: Unknown
Targeting and Tracking System: Unknown
================================================================================
Equipment Type Rating Mass
--------------------------------------------------------------------------------
Internal Structure: Endo-Composite 83 points 4,00
Internal Locations: 1 HD, 1 LT, 3 LA, 2 RA
Engine: XL Fusion Engine 300 9,50
Walking MP: 6
Running MP: 9
Jumping MP: 6 Standard
Jump Jet Locations: 2 CT, 2 LT, 2 RT 3,00
Heat Sinks: Double Heat Sink 14(28) 4,00
Heat Sink Locations: 1 RT, 1 LA
Gyro: Standard 3,00
Cockpit: Standard 3,00
Actuators: L: SH+UA+LA+H R: SH+UA+LA+H
Armor: Stealth Armor AV - 160 10,00
Armor Locations: 2 LT, 2 RT, 2 LA, 2 RA, 2 LL, 2 RL
Internal Armor
Structure Factor
Head 3 9
Center Torso 16 25
Center Torso (rear) 6
L/R Torso 12 20
L/R Torso (rear) 4
L/R Arm 8 16
L/R Leg 12 20
================================================================================
Equipment Location Heat Critical Mass
--------------------------------------------------------------------------------
Guardian ECM Suite RT 0 2 1,50
4 ER Medium Lasers LT 20 4 4,00
ER PPC + PPC Capacitor RA 20 3 7,00
ER PPC + PPC Capacitor RA 5* 1 1,00
Free Critical Slots: 0
BattleForce Statistics
MV S (+0) M (+2) L (+4) E (+6) Wt. Ov Armor: 5 Points: 18
6j 2 2 1 0 2 1 Structure: 1
Special Abilities: ECM, STL, ENE, SRCH, ES, SEAL, SOA
...might be worth sacrificing half a ton of armor and drop in an XL gyro for one more DHS.