CP5670, what sort of memory modules are you suggesting? You didn't really specify any. Thanks for the suggestion for the power supply. It puts out 100W less, would that make mush of a difference? I do like how it has plenty of connectors for what I want.
You're right, it looks like G.skill has several similar packs available now. For stock speeds or moderate overclocks, look for something that can run at 1.8V for best motherboard compatibility.
This stuff should be okay. The OCZ sticks have had problems booting on some boards that default at 1.8V, and also run pretty hot. If you want to max out whatever processor you get,
this is a good bet and seems to contain the same D9GMH chips that used to be in the normal Ballistix.
The wattage ratings are pretty much irrelevant. The Corsair one has a single, fairly large 12V line, which is preferable to the three rails on the Antec, and is known to have excellent voltage regulation. Antec makes some good and some bad models, although I don't remember which category that one you listed falls into.
8800GT's can be overclocked quite easily and... well... you get the idea. I hope you take the advice on not getting a Conroe processor because Wolfdale is getting close to being widely available--an E8400 is supposed to run you the same amount as that E6750, but the price is inflated because of the lack of 45nm chips--for now. Intel has to get two more 45nm fabs up and running and we'll see 45nm widespread again.
I didn't mention it earlier for the same reason, but it looks like you just need to search around a bit more. It seems to be in stock
here and for a pretty good price.