re: 1500 GB
When I built my old system, my system drive was 40 GB, and my data drive 75. Never thought I'd fill that up. I pretty much have.
Graphics chews up a lot of storage. Film even more. And I never throw ANYTHING away. I still have files I turned out on an Osborne.
I might do something with my D and E drive (500 each) that makes them backups for each other.
The other thing I have to find out is how 32 bit programs work on 64 bit Vista. That's important.