Corei7 processor are good performance in game handling , but dont purchase soon wait ! there is an issue of Overheating & performance break in the "NEHALEM" because of lack of motherboard Stable .When using the 4870X2 with the corei7 the system hangs the problem cannot be identified by the hardware test team . its a wonderful quad processor for gaming but bringing up the lot in to one single proc means should have many issues so dont buy at this time of launch wait for 2 months for complete USER REVIEWS.
Now....... the best buy for Gaming and Multitasking series is Intel core2quad q9550 ( 12MB L2cache,1333 fsb, 2.83Ghz, 45nm ) this processor is still handles with the corei7 almost its a very good future proof series available @ 17k
If u need budget Quad core means u can choose AMD PHENOM X4 9550 (2+2MB L2+L3 cache , 1800Ghz HT , 2.2Ghz , 65nm) this processor can handle Slightly better in games and multitasking , Can be as worthy quad core available @ 7K