1. Kingwin Lazer Platinum 550W Power Supplyhttp://www.silentpcreview.com/Kingwin_L ... um_LZP-550
If you really want more power, consider the Seasonic_X650http://www.silentpcreview.com/Seasonic_X650
Power demands are trending down not up. Either of these should supply you plenty of power for anything plausible coming down the pike. You probably really need 300-350 watts even running an abusive benchmark, even though Sapphire might say otherwise.
2. CPU cooler
Thermalright Ultra-120 eXtreme Rev. C
or if you want to maintain the ability to have a low height case
Noctua NH-C14 or NH-L12 (Noctua provides free new mountings as CPU mountings change... just keep your receipts)
You have too many fans
You might want to stay with the Sandy Bridge. The new Ivy Bridge seems to be having some teething problems and the IB will be about as fast except for the the graphics unit, which you won't be using.
5. "some gaming" Sapphire Radeon HD7950 3GB OC Edition? This is going to be your greatest source of noise... even if Anandtech says it is quiet for a video card. Get the largest passive Powercolor card available. Make sure the video card has some good air circulation.
6. Motherboard / Case
ATX size is becoming old fashioned. Consider a Micro-ATX. Consider a Langear Micro-ATX. It is built about as tough as they come, and its size makes it about as flexible of a case as you can get. http://www.lan-gear.eu/langear-home
It has room for a dedicated 120mm fan to supply cool external air to your video card.
7. Whatever you get, make sure you have a displayport connection. It is the only thing that can really handle upcoming high resolution displays. Without that, it will be a PITA in a few years when you want to get a nice 27 inch high DPI monitor.
8. Quiet cases no long matter so much. You want quiet components.
9. If you want something long lived, get an Intel SSD. Get their Enterprise industrial strength model, alleged designed for heavy duty use. Get the Intel 710 Series (Lyndonville). It will likely last for 10 years of civilian use. It uses single-level cell (SLC) NAND. It also uses capacitors to protect writes in the event of a disruption or power failure.
It seems like all the other SSDs are built to a low price with the expectation that they don't need to last to long before they will get replaced anyway.
I would store your data on a mechanical hard drive. You might want to use a higher level RAID meant for data safety and redundancy (as opposed to Raid 0 meant for speed)