Myself I got stuck with having to use vista with such a beefy setup (2.6ghz quad core machine with 4gb ram; XP wouldn't give me nearly as much bang than vista would). I recently upgraded to W7 64 Bit and am loving it (I highly recommend the 64 bit version if your hardware supports it)
I have a similar box Gizmo. Sounds like a
dell xps 420.
Mine is I believe a 2.2ghz quad 4gb ram.
Question...
Moving to w7 64 are you having any issues such as 3rd party software usage?
Or any addon hardware problems?