The kids got this for me on fathers day. click here it's a bit over, but comes with a full XP disk. I find it very good, after I removed the rubbish.
One of my sons was impressed with it, he wanted a smaller version and not all the features, so he bought this for £499 at staples. click here
I intend swapping one of the 256Mb dimms in mine, to his. I will then put an extra 512Mb in mine. £1100 for the two and I think they are worth it. click here