* Velociraptor HD is a bit spendy. I'd rather have 2 x 1 TB HD's for less than 1 300 gb Velociraptor HD, but that is just me. Even a 640 gb AAKS WD HD is almost as fast as the VR HD and is only $70!! I'd rather take the $150 savings and put it into a better GPU, like the 4870!!
* I'd rather have the Xigmatek s1283 CPU HSF w/retention bracket over the Zalman 9500a that you have selected. It performs better and is about the same cost too!
* CM PSU is okay. Things I don't like are that it only comes w/2 x 6 pin PCI-e power connectors. It does have 45A on the 12v rails and is >80% efficient though. I'd prefer the Corsair 650tx, which has 52A on the 12v rail and comes with 2 x 6+2 pin PCI-e power connectors. The 8 pin (6+2pin) PCI-e power connectors are going to become standard soon, since most of the higher end GPU's now have at least 1 of them.
* The Case is too expensive for my liking. It has $29 shipping, if bought by itself!! I'd much rather have a more manageable case that does the job well and is much cheaper. The Cooler Master 690 case is one of them that I'd consider. It's $83 shipped!! Cooler Master 690 without Power Supply Newegg's link to the CM 690 case, which has more details than the Buy.com link!
I would still consider the s775 setup. It'll cost you less and in 2-3 years when you upgrade, you'll still probably need to upgrade the mobo too. So don't think that the i7 is the best buy to get right now. Maybe in 6 months it'll make more sense when the prices of mobo's, DDR3, and the CPU's come down to acceptable levels.
i7 920 is $295 - q6600 $190 (OC to 3-3.6 ghz)
x58 mobo ~$220-400 - p45 mobo ($100-150)
DDR3 4gb packs ~$115-400 - $45-100 or so
so for CPU/mobo/4 gb's DDR3 your already at $625 or so ($350 for q6600 setup), unless you get better DDR3 than the CAS9 stuff! Yeah it's spendy compared to s775 stuff, so I'm not sure where the beef is. $300 is quite a bit of savings over the i7 build. Most people would rather save the $300 and use it for other better parts. IDK, but I don't have an extra $300 these days. The economy is in the tank and I know I've lost 15-20% of my pay over the last year, so unless you have $ bags, $300 is quite a big difference, at least to me.
If your budget is $800 or less then ya.
If your budget is $1000+ i7 is the way.
I had about every core 2 duo they made and I've had q6600s, all good stuff.
High clocked e8400s feel lots faster then the quads even @ 3.6 in most everyday stuff.
Currently I have a 4.05 e8400 and a 3.8 core i7 920. The i7 is way faster at everything. $300 for the performance you get is way worth it in my book. The i7 should be $700, good for me its not.
If your on a budget and only want one card go for the q6600 and p45.
If your a enthusiast/gamer/productivity person get the i7 so you can run anything you want.
Today on my i7 i was streaming movies to my xbox 360, surfing web, burning dvds, running anti virus, downloading 1950KB/s on news groups, quick parring 20 files at once and unzipping them all as soon as they were done on quick par, all without a single hickup, and I was under 20%cpu usage.