Ok, I'm a late comer to the thread, but I just finished my own supercharged system, see
here for specs.
As for the hardware, I'd recommend the OCZ Gold in your second post. I have it myself, and it screams. Best of all, the specs say 1600 MHz, 8-8-8-24, stable at 1.65V, however, on my system it's stable at 1.5V. Very cool stuff.
Processor-wise, go with the i7 920. It has a slower QPI, but it's not noticeable. It's also the most bang for your buck. Plus, if you do decide to OC in the future, with a good cooler, you can hit 3.4GHz on
air.
Another board you might want to take a look at is
this one from EVGA. They've been doing some interesting stuff lately. One thing about that current board you have is that it's stock memory speeds top out at 1333 MHz. To take full advantage of the OCZ Gold that runs at 1600 MHz, you'd be forced to OC.
The GTX 285 2GB is an awesome card. I have the stock one myself. I've heard some mixed reports about the stability of the superclocked version though. I'd recommend the stock one, as it's a little cheaper and can be manually set to the superclocked version's speeds. Also, the GTX 285 has on-board PhysX support, which means you might want to take a look at a motherboard that supports PhysX. Look on EVGA's website; they just released a cheaper version of my motherboard, the E760 Classified, that has PhysX support. PhysX is gaining support amongst mainstream games.
