That shopping list looks nice.
PSU - Not a component that you want to cheap-out on. Enermax and Antec have both been good companies, though I think that Enermax may be a better choice.
That CPU will carry you for awhile. It has excellent overclocking capabilities, and option you might want to entertain next year as apps become more resource intensive.
RAM - Your memory will not work in dual channel with a single stick. I recommend 2 x 512MB or 2 x 1GB. If you plan on overclocking use Corsiar XMS or OCZ Platinum (PC4000 for both)
Video Card - Great performance for the price, but quickly becoming dated. If you have the money get a 7900GT, which is quickly going to become a mid-range card.
I hope that this helps. Enjoy your Rig!
[SIZE=\"1\"]E6400 @ 3.4 , Noctua 120
7900GT @ 670/1680 , VF900
2 x 1GB Patriot 6400 @ 425
WD SATA 250GB
Neo HE 550
P180 / G15 / MX1000[/SIZE]