Always get the retail processor. At the very least this assures you a 3 year manufacturer warrenty and spending that much on a CPU it's definitely worth doing that.
The timings on the 2gb of RAM are value-RAM timings, and honestly I don't know if you really would need 2gb of memory unless you just really want to, but for money and practicality issues I'd say simply go with the 1gb faster series.
The PSU's....well they are monsterous. The thermaltake one has +12v-15a and then +12v2 - 15a or something like that. I've never seen a PSU that has more than one set of +12v rails so I dont know if you're supposed to add those up or what..
Other than that they all have a lot more power and strength per rail than you'd probably ever need even with the system you have planned, but still better safe than sorry I suppose.