here's what i would suggest:
-> why buy a case with a psu if you're just going to replace it? this doesn't have a side panel, but i prefer that because its annoying to try to go to sleep at night with half your room lit up from the light inside your case. plus this has a side vent which helps with bleeding off the heat inside and also has better cooling flow.
-> at less than double the price not only are you getting x3 space but also 16 mb cache. with magnetic memory storage getting as good as it can get now and being incredibly cheap you might as well buy the most you can at a time.
-> i found this and was wondering if you overlooked it somehow? not only would it be $10 cheaper after rebate but its core & memory clocks are higher. and it's still SLi enabled.
-> SLi supported and 30W more. also $10 off when you buy the hd i mentioned above. if you don't plan on going SLi then the one you have is fine.
->haven't bought any yet, but from what i've been told is really suited to OCing. along with the fact that it is 2.5 cas latency, has heat spreaders, and is a single stick for better upgradability.
-> in case you weren't planning on going SLi, this will save you $20 and should give you some more OCing potential. pretty much the same board except with different BIOS and extra pci-e x16 slot.
my suggestions with your mobo+cpu+dvd for SLi: $756.09
my suggestions with your cpu+psu+dvd for non-SLi: $706.57
i know it's more than the $650 you stated but most of it is shipping and i'm sure you oculd scounge up the extra b/c it is worth it.
see what 1 1/2 hrs. of boredom can get you?