Newegg offers some good cheap monitors that are actully pretty good.
Newegg.com - Refurbished: Seiki 40" 1080p 120Hz LCD HDTV LC-40G81 Newegg.com - Sceptre 40" Class (38.5" Diag.) 1080p 60Hz LCD HDTV X408BV-FHD Newegg.com - Proscan 40" 1080p 60Hz LED-LCD HDTV PLED4011A
As long as it it a 1920 x1080 or Full HD they work very good.I used to buy seperate monitors just for my computer until one day I hooked up my LG 50" Plasma and the games looked great .