For 1/35 scale modern Soviet main battle tanks, here is a list of kits/manufacturers that should start you in the right direction:
T-54: Trumpeter is the only one who makes one OOB
T-55: As previously stated, Tamiya's latest tank is great; however, Trumpeter makes a decent one for less than ½ the price. Esci/AMT/Ertl makes decent ones as well. Avoid the Lindberg one.
T-62: Tamiya's T-62 is the only one on the market. It requires a bit of work to bring up to today's standards.
T-64: Skif makes two different ones, T-64A and T-64B take your pick. Decent kits.
T-72: Tamiya's is the best, but DML has an OK ones out. You can find the DML kits in Italeri, Zvezda, Shanghai Dragon and maybe even a Revell of Germany box. Kirin also boxed the DML kit as the Iraqi Lion of Babylon, a collector's item now as well as the Yugoslav variant M-84. Avoid the Esci/AMT T-72 or T-74. Run from the Trumpeter (Wasan) T-72.
T-80: Skif's T-80UD is the one to get. DML boxes several T-80 variants. Avoid the Lindberg T-80.
T-90: Kirin made a T-90 conversion for the DML kits. Another hard-to-find item.
Check out
aefdesigns.com for various Soviet era MBT sets.