I managed to get a 210 Symmar-S 5.6 lined up for $285. From what I can tell from reading about the lens series it should be a great lens and the pictures of it online show it to be in used but prime condition.

EricR I'll have about the same mix of lenses you have except my 300 is an older Symmar in one of those quirky electronic shutters and it converts to a 500.