To save some money, consider this CPU/mobo combo. Put the money saved on the PSU and mobo towards a better graphics card. The one you have is good, but you might consider the 1GB version, a GTX 260 or a couple of these in crossfire.
They are both about the same performance wise, I would get that GTX 260 because it comes with a game, if you're interested in that. Either card will be great for 1680x1050. I assume your using the corsair? How about the CPU mobo combo? Are you going to be overclocking?
The psu/mobo combo I didn't see any link to it in your post so idk what processor and motherboard it is but I want to keep atleast the speed I have with the X3 or upgrade it , and I don't believe I will be overclocking if i ever get around to figuring out how to and actually doing it it will only be a by a small margin. Also the game isn't a big factor for me as I have it on my 360.
Overclocking on a black edition CPU like the PII 720 is easy, just raise the multiplier, and stress test while keeping at eye on temps. If you want to get more serious, you can get an aftermarket cooler. Look for overclocking guides on this forum and others.
Alright Well since I've cut down the cost a bit due to your suggestions (Thank you!) I think I'm gonna get the 4870 1GB version and yes I am going to go with that corsair PSU. Also one more thing to move my old files from my old computer to my new one is putting them on an external hard drive and transfering them over the best way to go?