For Succession War, either of these, depending on what's more important (range/armour or damage):
75T, 4/6/0, Std FE, Std; 11.5T Armor; 23 SHS; 3 ML, 3 LL; BV: 1.403; Cost: 6.328.000
75T, 4/6/0, Std FE, Std; 13.5T Armor; 22 SHS; 3 ML, 2 PPC; BV: 1.505; Cost: 6.534.500
Or post 3058 (4 tons of ammo):
75T, 4/6/0, Std FE, Std; 11.5T Armor; 12 DHS; 6 MRM10, 1 C3S, 1 LL; BV: 1.400; Cost: 6.986.000
Yeah, feel free to laugh, but this'll kick your arse far better than the two I posted above.
Jihad upgrade (also adds Apollo FCS and has 6 tons of ammo):
75T, 4/6/0, XLFE, Std; 11.5T Armor; 12 DHS; 1 ECM, 6 MRM10, 1 C3S, 1 LL; BV: 1.330; Cost: 16.523.500