I'm not sure, but your computer looks pretty good. Maybe you should just buy some better ram and overclock your 3.0 to 3.6 or 3.8. All your specs look good for what you are doing. 64 bit won't come for a while, so you can wait, especially when you have a computer that more than suits your needs. If you really want to get better graphics, then get a 6600GT also.