That PSU is one of Rosewell's best offerings and is actually pretty darn good for the price...I would trust it, but if your looking for something more acceptable, look at Seasonic or Antec. 16Gb is overkill, and if your overclocking, get two DIMMS of whatever you like. AMD loves timings over frequency. So a CAS 7 1600Mhz kit will run faster then a CAS 9 2000Mhz kit. Get an SSD for boot, and something like a Western Digital Green/Samsung F3 for storage. Ultimate doesn't give anything over Professional except BitLocker and support for multiple languages.
Hmm...a 1090T would save a few bucks, and your only robbed 100Mhz, which can easily be fixed by raising the multi a few notches. Other then that, it looks solid
Unless you NEED the power of Nehalem/SB, it will last a very long time.