Thanks TonyD for your comment. As I said I'm not an expert when estimating AMD's X4 or X6 performance when playing CoD but I think I'll still go for the 1055T. I'm going to use my PC also to other purposes where that 6-cores might be useful.
These new Radeons, HD7870 for example, are little bit over my planned budget for now but maybe later. Btw, this just like buying a new car: when you got to local car dealer and see the new models with a lot of nice features, you begin to rise your budget a bit by bit and soon you find yourself buying a car far more expensive as the original plan was (made with wife...).
Thanks to everybody of your valuable comments!