Just some quick thoughts...
Case...
Rosewill's name is synonymous with lower quality. I'd look at a Antec Ninehundred 2 or Cooler Master 690 in the $100 range.
Processor...
I think the i7-2600K is overkill, the big feature that drives the cost up so much is Hyperthreading and it doesn't seem to add much for most gaming situation or typical desktop uses. I'd go with an i5-2500K for a better value.
Motherboard...
First I'd go Z68 over P67. Z68 has everything the P67 has place QuickSync and SmartReponse. May not need either feature, but since it's the successor of the P67 and usually costs the same, there usually is no reason to go with the older chipset.
ASRock is another name synonymous with lower quality. It's owned by ASUS for just that reason. If possible, I'd look closer at a motherboard from ASUS, Gigabyte, or MSI first though.
Powersupply...
If you are not using SLI/Crossfire, you don't need a power supply more than 600 watts. So that is an area you can cut costs some more if needed. Corsair and Antec are two brands I like for their value and trustworthiness.
Harddrives...
I would not use RAID0 for any reason if you are not able to back it up. So if you RAID0 two 1TB drives, I'd buy an additional 2TB drive to back those two RAID drives up with. Unless you are okay losing everything on them. If a regular 7200 RPM drive isn't fast enough, I'd look at adding a smaller SSD drive to run your OS and games and hard drive for storage.
I'm not much of a Seagate fan. Their 7200.12 series drives sometimes suffer from an annoying clicking noise. The drives seem to be fine, but the clicking gets very annoying. I have two 2TB 7200.12 drives and both started doing the clicking after a few months. I've been meaning to try to RMA the drives, but Seagate's RMA process is the suck big time.
Western Digital I've never had any noise complaints about so far. And their RMA process is so epically easy.


