E550?

[pompalomp]

I was going to go with this set-up for my computer;

Asus P5k-e wifi-ap
Antec neo he 430w
2gb platinum OCZ rev 2
320Gb Hitachi deskstar
Antec nine hundred
Microsoft Vista Home Premium OEM
Keyboard and Mouse (cheap)
Arctic Cooler Freezer 7
Nvidia BFG 8800GTS 320mb
DRW lightscribe dvd-rom burner
DVD-ROM
Intel E6420

Total £780

Then i saw that the E6550 was about £10 cheaper and also seemed to be better in most ways. I would be very grateful if someone could suggest a reason, not as good an overclocker, if this is the case could you also suggest a replacement CPU core 2 duo for the similar price.
Thanks

[BUFF]

E6550 only has a 7x multi whereas the E6420 has x8 & I would be extremely surprised if the 6420 didn't do 333fsb too which would put you instantly at 2.66GHz by comparison.