Bear in mind that the Zvezda Lees are all short 75s, so some converting will be needed if you want the long ones. The Stuarts are fab, though. I've already got 9 for my own
MW Lend-Lease force.
A word of advice is to put the top of the turret on last, though, as it can be difficult to align properly without the side-plates on first, and is damn difficult to move/remove if you mess up.
Can't comment on the rest, but I might get some T-60s myself at some point.
EDIT: Stuart pictures--spoilered for size: