I would drop the Hitachi hd and get a Seagate. I used to use western digital but every drive I have had go bad lately is out of warranty. My seagate is in route to being replaced as we speak. I love the 5 year warranty. If my western digitals had a 5 year warranty I would have 3 more getting replaced as well.
I'm not a fan of Ultra psus. If you plan to get a second video card then try to get a Corsair or PC Power and Cooling psu. Much much better quality and upgrade headroom.
I'd recommend 2 4770's or 4780's in crossfire, Or 2 9800's in SLI. Toms actually just had an article recently on the twin 4770's being the best bang for the buck @$200 for the pair. Either way in that price range if your board can support it your going to get better performance with SLI or Crossfire. I love my GTX260's in SLI!