Itd be alot better with XP Pro or Media Center INSTEAD of 64 Bit VISTA.
Not to mention it would save you some cash..
Also Save yourself even more cash and get a 2 Gig set of G skill HZ. Much Cheaper, same or better Performence.
I dunnue when the price drop will occur, but I hear its soon, so you might want to wait and grab the proc you mentioned..
With the cash saved from making those changes you could get another Burner, or a back Harddrive.
Wheres the heatsink?
Tuniq tower, Thermalright ultra 120 extreme or Scythe Ninja/scythe Mine
Look for same products on zipzoomfly, might save more cash.