Neither case... Nzxt is generally low-quality cases... but they have some cool stuff. That Thermaltake, the doors on both sides means you'll be opening and closing them all the time which would drive me nuts. (I personally prefer cases without doors - thats is a preference), if you like that simular design, look at this Antec:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129043 or if you'd like a cleaner design:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129025
BTW: Your links to sites don't always work - please use Newegg as it geneally provides better info that manufactures with more photos.
CPU Cooler: Sunbeam isn't exactly high on the list... (AFAIK) - check out this review:
http://www.anandtech.com/casecoolingpsus/showdoc.aspx?i=3210&p=6 Artic Cooling is top of the list... most quiet too (next page) - its in my box. Its considered a low-cost cooler at the $30 range. -$20 are standard quality HSF (about the same as intel).
http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134 Currently its $37... but a week ago it was $25 (I guess that depends on their supply) - when I ordered mine they were $28... heheh.
ATI 4870 : Get the 1GB version... you can always OC it yourself anyways.
Q9550: You can afford, so go for it
My Q660 tops out at 3.2, but I prefer to keep it at 3.0 (fast enough). People have that Q9550 hitting 3.6~3.8Ghz with air-cooling, from my cooler even! (Use Artic silver for better temp). Getting Core2s to O by 600mhz is the norm... go in steps. Up a notch at a time... every few days or a week. SLB8V
EO Stepping is the version to get (cross your fingers).
ASUS P35 board: Asus isn't doing as good as they used to. I'd take the gigabyte over Asus, and I've built and sold lots of ASUS systems.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128337 This one is higher rated - and note that this is a newer revised board... the previous model had one 2 awards from newegg. BTW: While the ASUS has a cross-fire slot, the 2nd slot only goes up to 4x speed which kind of makes it useless. Also its SATA connectors are not in a great place with a big-video card installed. ASUS's heat-pipe cooling system is more show than functional. ;(
4GB Corsair: Bad choice of memory... why pay $175 for those and severely limit your memory options? Get these for $135 and after rebate $95:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145214 - Will run cooler and more reliable too.
VelociRaptor Drives: Can't get any faster (other than top end SSDs) - don't bother with RAID-0 on thoses, no real-world performance improvements... other than benchmarks. They are already fast.
Go with red lighting (because I say so)
DVD buners: None of those. $20 each? And one is an PATA drive. Pioneer $30, newegg:
http://www.newegg.com/Product/Product.aspx?Item=N82E16827129032
PSU: $110 - 750watt Corsair... May come with a nice carry bag for it too (I dunno why - at least the 650watt model does)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006 - These PSUs are super quiet and very top end... Look great in a black case - especually an Antec 1200...
I wish I had one of these
When on Newegg - double check on their COMBO deals, there could be a chance you have an overlap, but IF you don't choose a combo or free gift option - you won't get it. I've gotten some free MP3 players that way... or stress relief toys. Hey, if you want that 750watt PSU for almost free ($100 off) - just get the combo with the ABS case... er, thats a $600 case
Funny thou, if you get the 650watt PSU version, they'll knock off $20 off that gigabyte mobo I recommended.
If you go with the Antec 1200 (high reviews) - it comes with 6 fans pre-installed and all lighter blue (Thermaltake, orange fans.. thats their thing) - all fans have speed control (nice)... if possible, check out these cases in REAL life. Any case I talk about on this site, I've used, built or played with at 3 local computer shops. Cases with huge air-flow should have filters which Antec uses on thier higher end cases. (just cleaned mine out last week).
Enjoy....