I sold a '92 Series 2, (56cm) with Shimano 500 EX components for $300 last October in SoCal. It was in great shape except for a small ding in the top tube.

Your bike looks very clean and maybe has the same component group or 105 perhaps?, even better maybe?
It looks like a small frame, maybe 50cm? Being that it is small that would bring a premium.
Where I live there are a lot of 5'2" female cyclists that would love to own that bike and since it's white that's even better for the ladies.
In SoCal I would list it at $350. YMMV. PS. That stem looks a little long for a small frame.