Specs for a CAD computer

I'm just trying to sort out a spec for a CAD computer.

At the moment I have an Intel Duo, about 18 months old, running Vista 32 bit, with 2 Gb of Ram and a Quadro FX1500 graphics card. I have a 20" main monitor and a 17" second monitor,both Philips. This setup seems to go well, I have the occassional crash, but who doesn't?

For normal computer users, a certain standard of computer is fine-all you need is about $NZ850, plus say $NZ200 for a monitor and you are done.

Just to add to the fun, the NZ dollar has depreciated against the US and Euro (it is about
NZ$1=US$0.53 at the moment.

I have priced up HP workstations-they seem to have quite a large range, it really comes down to how much money you are happy to pay in these recessionary times!

What I'd really like would be an Intel Xeon Quad core with a 24" main monitor/20"second monitor, high end graphics card, 64bit 6GB ram and so on. Hmm...just dreaming really....