If you are not running any platoons in favor of all vets, don't bother with a
CCS as your
HQ. A Lord Commissar will similarly get much less bang for his buck, so I'd personally do a tank commander. Pasknisher is fairly common and packs a heck of a punch. Take multimeltas and a hull lascannon to beef up his anti-tank/anti-
MC. The side Russ depends on your points budget, but almost anything goes because of the tank order to fire at separate units. I tend to do a standard Battle Tank or an Eradicator if I need to save some points.
If you're rushing a lot of transports forward, I would use at least one Hellhound variant to add to your front line target saturation as well as some quick firepower. The Hellhound is generally the best, but against
MEQ lists and high T, the Banewolf may be more helpful if you can live without Torrent. I typically go for the Hellhound.
Adding heavy support is probably the most variable part of a list, with one exception:
take a Wyvern. It's just too useful and too cheap to not consider, and its 0-48" range means it'll always be useful. They're clearly best against lightly armored hordes with Ignores Cover, but twin-linked and shred go a long ways against
MEQ and 2+ saves. Hit any clumped infantry in range and make your points back in single turn of shooting. I have found Basilisks and Manticores to be nasty to go up against, but these will need to stay as far back as you can get them. Meanwhile, more Russes are more heavily armored and with a little luck may even shrug off melta shots against their front armor.
However, without at least one platoon and/or some conscripts, your biggest weakness will be close combat. Your Chimeras and Hellhounds if you brought any need to advance forward fast anyways, but Russes and artillery are at huge risk without bubblewrap. I have fared better with a 40 man blob and 1 or 2 vet squads than with pure vets. However, if you are going fully mechanized, at least be aware of dangerous
CC units, deep strike, and outflank, as units with any of these + any kind of anti-tank capabilities
will cause issues, so deploy your units to counter these threats or at least spread out to minimize the damage they will cause.
I hope any of this comes in handy. Good luck!