Have you considered building your own box? You probably can save yourself some pretty decent cash by rolling your own. Once you decide on the set of components you want to get, you might want to look into buying and assembling them yourself. That's what I did, and couldn't be happier (note that up until this machine, I had never built my own rig.) Seriously, give it a shot. BTW an excellent online vendor for PC hardware is NewEgg, found here:
http://www.newegg.com/ Great prices/service. It's where I got my stuff, and I'd recommend it. Good luck with whatever your decision is. -- J.W.