I bought the 5" Zenith screen from Geeks.com today (along with guitar hero). Before anyone jumps on the 5.6" screen, read the reviews at Amazon. Slow refresh rate makes motion a big blur on the 5.6" screen, among other problems.
Thanks, bro. Just ordered one from Geeks. Also picked up the 5" PS2 LCD screen for $40 -- should be great for playing the PS2 on the road, or watching DVDs on the road.