Also, lots of shops have a nifty laser fitting booth that calculates a frame range for you after the salesperson takes a few data points.

You're a common enough size that they should have a fair amount in stock that will fit you -- your best strategy may be to just start visiting some shops and testing some bikes.

Edit: Oh, I just reread your post and realized you are looking at Ebay/Craigslist... Hmmm... it still might not be a terrible idea to go to a shop and talk to them a bit.