You might want to wait a bit. Sony is supposed to be coming out with new readers in August. Well, maybe not new as in totally different but upgraded ones of the current line. There was a post on it in either the News or General Discussion forum.
I upgraded from a 300 to 350 and adore my 350. I even went and bought a second after being afraid that Sony wasn't going to make them anymore. OOOPS! Unless it's a dead unit, I'd wait before buying to see what Sony comes up with in August.