Thanks for your replies, I have been watching craigslist and will continue, but there is not a lot popping up in my area (Tampa, FL) and a 52cm would be small, I had a Trek Madone that was a 56, but I'm looking to go with a 54 for this build I think so it's a little more compact and maneuverable. I do not necessarily have to have a cross bike, just as long as it has enough clearance for a little bigger tires would be preferred. I had even thought about going with an older MTB frame, but I know most have vertical dropouts which I do not think would work as good with out adding a chain tensioner which I'd like to avoid if possible.