I am using the LCD4Video.com 7-inch HDTV monitor on my Sony Z1's. They were $250 on the NAB floor, and once in a while you an get them for that on their site. The monitor is pretty good for what it is. Much sharper than the cheap "security cam" moitors for $150. It is missing some of the high-end features of the $1600 monitors, but if all you need is a larger screen for framing, then this is it.
Steve Mann
MannMade Digital Video
http://www.mmdv.com