Stick with XP if you can, at least until the service pack for Vista is released. If you use the Aero Glass windows theme (and you will, with that hardware), battery life is woeful. Of course, thats irrelevant if its going to spend most of the time on your desk.
The hardware looks spot on. You will be able to throw pretty much any application or game out there at the moment and have it run very nicely on it.
The greatest delight is to mark one's enemy, prepare everything, avenge oneself thoroughly, and then go to sleep.