e6550 is a good processor, pick it up instead of the 6600, in fact i'm gonna stop recommending e6x00 series all together.... just teh e6x20, e6x50's from now out, then theres 4000 series
well they really are numbered for better. if your not overclocking that is, the e6700 is really better than the e6600 etc.. but not for price performance for overclocking ratio.