theres a few out there m8
for best sim try "panzer elite" games made by jo wood
for modern tanks try "battlefield2" and "bf1942" for older tanks made by EA
WWII-Tank-Commander made by reef isnt too bad for pc
"iron warriors" for t72 tanks
also "Red Orchestra: Ostfront 41-45"

and probally the best game to get is "Company of Heroes "

there are loads out just depends on which games you like most ie FPS or sim games