CoolerMaster-690 case, CoolerMaster Real-Power-Pro 750 psu, Asus Maximus Formula motherboard, Intel Q9450 cpu, G.Skill 2x2 gb 1066 ram, 2 Pioneer Black dvd burners, 500 gb SATA Seagate Barracuda 7200rpm.......Any ideas on what the best card is for this rig?