I was planning to build or perhaps buy from a bespoke manufacturer. I tend to avoid the big names like Dell to be honest. Core i7 seems like a good choice - I was thinking of the i920 with DDR3 memory and a RAID 0 (mirror) disk configuration.
Can you give me a recommendation on graphics cards? I don't really play games so don't need much in the way of 3D power. Overall, I'd like the PC to be quiet so I think a less powerful graphics card would be a good choice.
A final, perhaps nooby, question about Windows 7 64-bit. Can it run 32-bit apps too or do you have to find the 64 bit versions?