If i was you buying a new tank..Kt or other wise. I would get the cheapest most basic one i could find. Unless they state the upgraded parts by name. If all it says is things like metal gearboxs. That could be any thing. Where as if it says Asiatam boxs. You know you are on to a winner. Also that goes for metal tracks. Asiatam metal tracks are good very good. Others not so.
So don't go bunging good money out, only to find parts needs replacing.
Buy cheap, upgrade with quality parts once. Your pocket,and your other half will love you for it

I hope you find what you are looking for.