2 things:
a) don’t waste your money on that pci slot cooler! I have used them before and they do almost nothing!
why are you buying the e6600 instead of the e6750? I see no reason for that unless your motherboard doesn’t support the 1333mhz fsb of the e6750 (its cheaper than the e6600!). If that is the case, I will gladly sell you my e6600 at a good price so I can buy the e6750 
Oh also about the videocards… I would say go ahead and get the cheaper one, you can always overclock it yourself