Is intel i5-2500k + MSI P67A GD55 a good combo?

Well the 2500k will fit fine and is a great performer, especially because you can overclock it to the heavens so easily, but you forgot one of the major components that will judge whether your performance is good or great. Your video card, to run crysis 1/2 on max a minimum of a gtx 560 ti or an hd 6950 2gb would suffice(not completely maxed, keep AA off) Gtx 570 is a step up, or even a gtx 580.