In principle, I'll support any that aren't limited to small numbers of factions - eg. no FedSuns-only, no Falcons-only.
However these are pretty widely available:
R10 - about time we had an omni-APC, one squad in, one hanging onto the roll bars!
Gossamer - just looks cute, and we could use some new VTOLS
Hadur - give the Arrow Regulator some competition
Ballista - even if it does die off post-Jihad, that's still plenty of time
Sekhmet - looks good!
Sorry, Narukami is DC-only and Red Kite is FWL-only, which is very limiting, and the Hanse is stupid ;)