I'd say a Timberwolf Prime.
I made a more heavily protected version of that for something like this thread.
Heavy Generalist - XL: Prime
Clan Tech
75 Tons
Endo-Steel Chassis
350 Rated XL-Fusion Engine
16 Double Heat Sinks (32 Dissipation)
5/8 Speed
15.5 Tons Ferro-Lamellor Armor
Angel ECM
2x LRM-20 w/4 tons of ammo
1x ER Large Laser
1x ER Medium Laser
1x Laser Anti-Missile System
Targeting Computer
36 Heat Maximum
I decided to keep the iconic LRM-20's.
Prime-A is a bit different in weapons.
2x LRM-10 w/2 tons of ammo
1x ER Large Laser
1x Large Pulse Laser
1x Laser Anti-Missile System
Targeting Computer
34 Heat Maximum
17 Double Heat Sinks (34 Dissipation)