Anyone play the Total War games? Shogun Total War, Medieval Total War, Rome Total War, Empire Total War. For those not aware they mix RTS with a turn based system. The latter games have a pretty advanced economic element to them. Really good games. The battles are about as close to real warfare as you can get. Also, each game is made to be easily modded by people so there are an endless number of variants to each game made by internet geeks.