Not to be outdone by Stormcrow, I present my tournament list:
Company Command Squad(175)
3xPlasma Guns, Plasma Pistol, Regimental Standard, Chimera
3xGrenade Launchers, Demolitions, Carapace, Chimera
3xFlamers, Demolitions, Carapace
Platoon Command Squad
2xInfantry Squads + 1xCommissar
2xMortar Heavy Weapon Squads
Leman Russ Battle Tank(150)
Leman Russ Demolisher w/Plasma Cannon sponsons(205)
Enclosed crew compartment, bastion-breacher shells
45 points left over, I'm not sure what I want to do with them. Could upgrade the platoon command squad, or give heavy weapons to the infantry squads.
Overall the list gives me a mobile element (chimeras, leman russes, vendettas) and a 'home base' element (20 man combined squad, mortars, medusa).
The melta and plasma squads can handle termies and MEQ, and the Vendetta + veterans and medusa handle tanks.
The mortars are a pain to all infantry from Terminators to Orks.