The Skif kit of the T64 isnt bad for its age. I have a couple somewhere, including one with the accurate armour turret to get rid of some of the imperfections. But it really didnt need it. If you are building the tracks, and are frustrated they dont have holes in all the tracks, i found a hole punch, followed with slowly drilling them out with a hand drill worked very well.
T72M1 from tamiya is still very good. As is the Chally 1.
Anyone got any recommendations on a decent T62? The only one ive ever built was the Tamiya one, which had massive issues.. Understandable perhaps, in that it dated from the early 70's.
Get the skills together and when you can afford it, invest in an RC tank, of which there are a lot on the market. If you figure out the airbrushing, it pays dividends later.