im looking at buying a mac to do all the graphic design on for my small business umm what would i be looking at to run corel (if it has a mac ver) and the whole adobe suite (illustartor, photoshop) i was thinking a 2ghz system with 1gb ram and OS X but one of my employees recons that each os is made to suit the mac its bundled with and that you cant do any hardware upgrades.

im very confised so if someone could help me out PLZ i would greatly appreciate it