First of all, welcome to the Forums!
Your build looks good, but it might save you more money to take advantage of the specials at NCIX instead of PMing.
For your graphics card, the 260 should last you for some time before you have to upgrade, you can even SLI it down the road since the PSU you're getting has enough juice.
Not sure if I'm right, but is the case you're getting the HAF 932? You might want to get a clearer picture or list what you're getting so that others can see.
Also, do you have an extra copy of Windows XP lying around? I'd recommend you to wait for Windows 7 instead of buying Vista now, since it's coming out at the end of the year.
EDIT:
Rumors: Buying Vista This Summer Could Mean a Free Windows 7 Upgrade
Looks like it might actually be worth buying HP for that price right now. Then again, it's just a rumor, so you'll take a risk.