I am going to upgrade my current AMD A64 X2 4200+/GB GA-K8N-9-RH/4GB XMS DDR 400/460GB of HDD/Sapphire X1600XT system to a Intel Core 2 Duo E6600 Conroe/GB GA-965P-DQ6/2GB XMS2 DDR2 800/640GB of HDD Space/and Crossfire with dual sapphire X1600XTs will I be happy with my upgrade?