I just bought a Dell for $558.
Since that time I have dumped the desktop and have been fine w/ a used Thinkpad T-20 w/ 14" LCD and a wireless router.
I won't buy HP again. I may never buy another desktop box again either. Laptops are currently cutting into desktop marketshare and for good reasons.
Its nifty having a computer on your lap and your legs in the up position as you relax on a recliner.
Its always different strokes for different folks.