Check out office desks
I saw in home recording magazine, that using office desks and stuff, was almost the cheapest way out. I got a desk setup with a corner station and two 50 inch pieces on either side, for 300 bucks brand new. Sauder.
I use dual monitors, and will be going to triple flat panels, which will give even more room on the desktop. It really looks good though. I would suggest custom is nice, but if you need something professional looking and ready to go, try Office Depot, and get a corner unit and some 36 or 60 inch side desks to connect to it.
R.