Welcome to the mad house.
I build all sots of things, but when it comews to armor I normally specialize in Air Force armor.Granted there aren't a lot of choices involved, but it's a personal thing. When it comes to the Army, the Ontos is my favorite followed by the M-48 , Stug III, and a couple others.
Enjoy yourself here, there's a lot of good people with a wealth of knowledge. Any questions, just ask.