I'm using the pre-painted World Tank Museum T-34's for my Kursk project. Finding these tanks was a stroke of luck because the time and money that would be required to field all the tanks required in metal would have been a project-killer. The plastic WTM T-34 tanks come in three different paint jobs and the turrets even swivel.
To add some variety to the plastic tanks, I'm customizing them with accessory packs made by Pithead Miniatures. These packs have tank commanders, tank riders, fuel tanks, and other stowage. I'm already using the tank commanders to make my command tanks stand out on the table (command stands also have circle bases). Below are a few pictures of some of the tank riders I've painted and glued to my tanks.