I'm sure i'm not the only one who does it this way?
get on ebay - sporting goods - cycling - road bikes and parts - bikes. then get some filters happening!
5'11" - (as an estimate) filter for 56-57cm. Then filter for steel, then filter for used. you then get maybe 100 bikes to choose from... craigslist will work the same but i dont think you can filter concurrently? i know a lot of people bash the bay, but for this type of thing, its hard to beat
for $400 you can expect a pretty nice rig from the early 80s. if you find something from a brand name that sounds familiar (or better yet, you see mentioned here in a positive light) made from reynolds, true temper or columbus tubing and any campag gear, or shimano 105, 600, dura-ace, buy it... you'll love it and i think it will be exactly what you are hoping for. I'm excited for you buddy!