I'm currently using a 17" non-wide screen monitor w/ built in speakers, attached to the wall via ergo-tron mount, and hooked up to a SageTV HD extender. I like it, but the monitor kinda sucks, and there's no headphone jack.
So... I've been looking, and either am going with a Visio 19" TV, the Magnavox 19" TV in Target's add this week ($150), or a Dell ~20" monitor with their add-on sound bar. Both TV's are 720P, and the Dell is 1080P, not that i think it matters at that TV size.