Hello everyone, I hope this is the correct forum (if not let me apologize up front).

I am looking for a used bike (budget is $400 max) that I can commute to work (daily at just under 10 miles round trip and a few times a month at 23 miles round trip). I am in California so I don't have to worry about a real winter but there is rain (well most years anyway). I've been lurking on these (and a few other forums) and have some up with a few options and just wanted to get some feedback on the quality of the bike. I have visited a number of LBS and either I don't like what is in my range or if I do like it it's out of my range.

I will be making some changes to make it a more comfortable upright commuter (spare my back). I do tend to like the '80's lugged steel but I'm open. Anyways here are the ones I am considering (all of these are in very good condition):

Trek 400 Elance
Schwinn Tempo (upgraded to Shimano 105)
Schwinn Super Sport
Trek 510
Raleigh Competition
Cannondale M500 (cheapest option)

Any feedback will be greatly appreciated (thank you in advance).