hey man, I run my 22" Sony monitor...it was the biggest I could find at Fry's electronics. it's the G250..something I think. I'm not right infront of it right now...not at home.
It works beautifully....I run my Linux at 1600x1200 resolution. Impecable picture,
also..if you want advice, never get a piece of crap flat screen...cuz that's what they all are, expensive pieces of crap, my monitor will kick ANY stupid flat screen monitor.
anyway...got too off the subject, hehe.
For other hardware...don't get anything that is USB (it sucks), and what ever you do get, like modems, etc...make sure it says Linux compatible for the least painful instalation of linux,