(first off, I know this has been discussed before, but still haven't found a good answer on benchmarking) I have a iMac 3.06GHz, 4GB RAM, 1TB HD, and the 8800GS video card. I currently am running XP, but I'm wondering if moving to Vista may be better. I use windows for Quicken 2009, and mostly to play PC Games. Some of the games I play (or plan to play) are... Oblivion, Flight SIM X, NWN2, Fallout 3, CIV4, Warhamer Online, Bioshock, WoW, and possibly any games that come out in the next year, such as Starcraft II and Diablo III... along with some Microsoft Office and maybe some light programming. My concern with the gaming is that I'm losing the DirectX 10 capability. Why I am trying to determine is: A.) Is there any reliability issues between Vista vs. XP B.) Is there a performance issue between Vista vs. XP (I currently use the latest Nvidia drivers 175.xx, will I be able to do this in Vista) C.) When I had a 2.8GHz iMac from Dec 07, it had sound issues in Vista, is this still a problem for the 2008 3.06GHz versions? What are your real world experiences? What deciding factors made you choose 1 or the other?