I used to have the "standard" dual 20in setup, but recently got the Dell 30in. Right now my desk isn't big enough to hold 2x 20in's and the 30in, but I'll be moving out soon and getting a new desk that has enough room for all 3 monitors, plus more stuff (laptops and printer)
I've got so much computer crap. I have another perfectly good dell desktop capable of running dual 20in's (my old PC), along with a dell laptop and Apple Macbook Pro.