Hello, I intend to buy the new mac mini. I want to play games casually, like CoD or WoW. What configuration would please me better from quad-core i7 2.0GHz with no discrete GPU or dual-core i7 2.7GHz with the Radeon Chipset ? Why ? EDIT: When not playing (most part of time) I run videos, films, photos, music, sheets and docs intensively.