A couple of notes on the Cannondale. He has it described as a 3.0. It's not. 3.0's were first released in '89 and had cantilevered rear dropouts. I would guess that this is an '85-88 model. You can ask for the serial #'s to check. Go to vintagecannondale.com to look up the #'s. He looks like a seller of lots of bikes so you can use that info to get him down a little bit. Although $200 doesn't sound bad though if it is in good shape. I had one and loved it. It's ride was a little rough but I was on 19-21mm tires back then so I am sure todays wider tires would tame a bit of the rough ride. 23 would definitely fit and 25's might. I still have and ride my 3.0 regularly on 25's. At 6' I think the 58cm should be a good fit unless you have freaky proportions. Good luck.