It may have been a "Company Command Squad" which is similar to a "Platoon Command Squad" except that it's an
HQ choice... more orders... more Wounds on the Commander... more upgrade options... just plain better.
As for Russes, assuming a stand-alone unit of 1, my suggestions would be:
150 - LRBT - Hull HB: Ordnance ruins your other guns' accuracy. Don't spend the extra points.
175 - LR Exterminator [Generalist] - Hull Lascannon, 2x Plasma Cannons, Heavy Stubber: Good at taking on Light / Medium vehicles. Good at killing all types of infantry.
160 - LR Exterminator [Anti-Vehicle] - Hull Lascannon, 2x Multi-Melta: Good at hurting Deep Strike Vehicles, like Dreadnaughts. Best Russ for Secondary Role as anti-flyer.
175 - LR Vanquisher [Generalist] - Hull LC, 2x PC: Fantastic for hunting elite infantry, monstrous creatures, and Light / Medium vehicles. You've got Lasguns for hordes.
165 - LR Vanquiisher [Dedicated Anti-Vehicle] - Hull LC, 2x MM: Ok at hunting elite infantry, Monstrous Creatures. Quite capable of cracking high
AV vehicles.
160 - LR Eradicator [Cheap and effective Generalist] - LC, 2x PC: Truly Jack of all Trades. Only 10 points more than a
LRBT. Great at killing hordes [even in cover!], better at killing elite infantry than an
LRBT, enough shots to make a decent Light to Mid
AV hunter.
170 - LR Demolisher - Hull HB: Ordnance ruins your other guns' accuracy. Don't spend the extra points.
165 - LR Punisher - Hull HB, 2x HB, Heavy Stubber: Dedicated infantry killer. How many saves can you make?
185 - LR Executioner [No Preferred Enemy] - LC, 2x MM: Elite infantry killer, with Anti-Vehicle secondary role. Without Preferred Enemy, you'd burn yourself to death from overheat rolls, or at least not be able to fire as much as you should due to 1's stopping the shot, even without damage.
195 - LR Executioner [Preferred Enemy Generalist] - LC, 2x PC: Ultimate solution to 2+ Saves. Less efficient the more "hordey" your target gets, but still good because you'll get lots of hits. Quite decent at taking out light / medium vehicles due to number of shots.
As Russes are Heavy, and thus move VERY slowly, I prefer to take Generalist choices, so that they're good no matter what targets my opponent gives to me. To put a point on it, you move too slow to pick your targets, your targets are whatever your opponent leaves in front of you.