So clearly I've changed my tune on a Mac. I've now decided to keep my current case and some parts, and upgrade the major components.

So far I'm settled on:

- Core i7 920 CPU (a little overclocked)
- Arctic Cooling Freezer XTREME Rev 2 HS/F
- DDR3-1600 Corsair memory
- Western Digital Velociraptor 300GB
- MSI X58 Platinum motherboard

I have ideas for the rest of the components, but I wanted to ask some questions of you folks:

1) first, a question about memory. I know about the limit of <4GB for 32-bit operating systems. So what is Windows 7? Is it a 64-bit OS? I can't seem to find any info on this. And I assume that these Core i7 CPUs are 64-bit? Essentially, am I going to get any benefit from 6GB of memory?

2) What I really want to ask you good folks about is video cards. I haven't been following the market for a few years now, so I'm not sure what the situation is. Here's what I have to consider:
- I'm not looking to get the most FPS out of Crysis or anything like that. I play a few games, but nothing very taxing on hardware.
- I'll be using the computer for video editing and conversion.
- I have a 30" monitor.

From the research I've put into this purchase, the conclusion I've reached is that for the above conditions, when it comes to graphics cards I should be focusing more on memory than GPU speed. Is that correct? It seems to me that Windows alone prefers to have a good amount of memory to drive a 30" monitor. I've been looking at cards with 1GB or more of DDR3 memory. Is that where I should be looking?

3) What should I be looking for in PSUs? I don't feel any need to go for a 1KW unit, but I think I'd like at least 600W. I mean, I won't be putting a lot of drives in the box, but I figured that I'd need a decent amount of power to drive that CPU, graphics card, 10K RPM drive, and a few optical drives.

Thanks for any help, folks. I'm pulling the trigger on this on Mondy, probably