What you've used before worked. Regular jump drives are far too expensive, and relying on DropShips means having to defend too close to the planet for the inbound nuke problem. I rolled back my Sampan designs to a Mark I version below:
Sampan Mark I
Tonnage 50,000.0
Thrust 12,000.0 4/6
Fuel 2,000.0 204.7082907 Burn Days
Pumps 40.0
SI 5,000.0 100
KF Drive 25,000.0 15 LY Integrity: 3
Sail 33.0 Integrity: 3
Controls 125.0
Base Crew Quarters 275.0 5 55 Base Crew
Heat Sinks 0.0 199 Free/199 Total
Armor 100.0 80 Standard Points
ER Large Lasers 10.0 2 5 Nose 12 heat each 24
White Shark Launchers 480.0 4 120 4 Corners 15 heat each 60
Small Lasers 8.0 16 0.5 Dual mounts in all arcs 16
Medium Lasers 24.0 24 1 Triple mounts in all arcs 72
Communications Equipment 2.0 2 1 2 additional crew 172 Total Heat
Hi-Res Imager 5.0 1 5
Small Craft Cubicles 200.0 1 200 5 Bay Racks each
ASF Cubicles 900.0 6 150 2 Bay Racks each
Gunners 55.0 5 11 Long Term Quarters
RTOs 10.0 5 2 Long Term Quarters
Bay Crew 110.0 5 22 Long Term Quarters
Marines 150.0 5 30 Long Term Quarters
Armored Marines 60.0 5 12 Long Term Quarters
Infantry Bay (Foot) 10.0 5 2 30 Bay Racks Each
BA Bays 24.0 8 3 6 Bay Racks Each
BA Techs 15.0 5 3 Long Term Quarters
Doors 0.0 0 8 1 Small Craft, 6 ASF, 1 Cargo
MASH 3.5 3.5 1 1 Operating Theater
Medical Team 25.0 5 5 Long Term Quarters
"Field Kitchen" 3.0 3 1 3 additional crew
Cooks 15.0 5 3 Long Term Quarters
Upgrade CO/XOs cabins 10.0 5 2 Officer Quarters; they share a "Jack and Jill" head
Life Boats 238.0 7 34
Missle Bays 1,600.0 16 100 40 tons per White Shark (10 in each bay)
Consumables 347.5 0.695 500 Crew Days (1 Crew Day = 139 Man Days = 0.695 tons)
Cargo 1,142.0 Usually more food, always equipment for harvesting water from asteroids
It costs out at 2,536,818,000:
Costs
Controls
Bridge 700,000
Computer 200,000
Life Support 1,170,000
Sensors 80,000
Fire Control Computer 100,000
Gunnery Control Systems 80,000
Structure 10,000,000
Drive Unit 1,000,000
Engine 12,000,000
Engine Control Unit 1,000
K-F Drive
Drive Coil 60,000,000
Initiator 25,000,000
Controller 50,000,000
Liquid He Tankage 150,000
Sail 1,650,000
Charging System 500,000
K-F Support Systems 1,100,000,000
Attitude Thrusters 25,000
Docking Collar 100,000
Fuel Tank 400,000
Armor 1,000,000
Heat Sinks 398,000
Crew Quarters 695,000
Officer Upgrades 50,000
Lifeboats 170,000
ASF Cubicles 120,000
Small Craft Cubicles 20,000
Infantry Bays 150,000
BA Bays 360,000
ER Large Lasers 400,000
White Shark Launchers 520,000
Small Lasers 180,000
Medium Lasers 960,000
MASH Core Unit 35,000
Field Kitchen 25,000
2 Tons Communications Equipment 20,000
Hi-Res Imager 150,000
Sub Total 1,268,409,000
Final Cost 2,536,818,000
The crew (139) and extra racks (95):
Marines 50
Officers 3 (1 BA)
Foot 28
BA 11
Medics 5 Chief (PA) and 4 Corpsmen
BA Techs 3
Air Wing 18
Pilots 8
Air Crew 3
Techs 7
Wardroom 11
CO 1
XO/Nav 1
Airboss 1
Eng 1
Weps 1
Div Os 6 DCA, 1st LT, Ops/ANAV, Guns, Missiles, Supply
Crew 58
CMC 1 Direct Report to CO
Ship's Sec 1 Direct Report to XO
Missiles 6
Supply 5 Includes the cooks
Guns 8
Ops 12
Deck 15
Engineering 12
Total Crew 139
Extra Racks
Flight Bays 17
Marine Bays 60
BA Bays 18
Total 95