Corsair TX650W 650W would be great. We are not going to worry about BIOS update at this point, it doesn't address any important issues, don't know what the Beta does. Change the RAM speed now, it will give you faster timing and I like the FSB and RAM to be in sync. Try not to use the system much or for gaming till you replace the PSU, I wanted to say don't use it at all if you can. If you still have your old video card, you can give it a try with the new PSU, you never know!