hi, im 5'11 and im trying to find a decent road bike to buy on craigslist as a beginner who wants to train and maybe try to race. here is what i have found so far. i am trying to figurre out which ones are worth meeting up and trying, and what kind of offers i should make. Im trying not to spend over 500 but we will see what happens

http://ventura.craigslist.org/bik/3215959333.html
http://ventura.craigslist.org/bik/3232504975.html
http://ventura.craigslist.org/bik/3231188548.html-Medium Giant WindMark 2700
http://ventura.craigslist.org/bik/3220946836.html
http://ventura.craigslist.org/bik/3220615354.html
http://ventura.craigslist.org/bik/3219472150.html
http://ventura.craigslist.org/bik/3206682675.html- mens large
http://ventura.craigslist.org/bik/3139951058.html
http://ventura.craigslist.org/bik/3209813405.html
http://ventura.craigslist.org/bik/3206612116.html
http://ventura.craigslist.org/bik/3229153634.html

sorry for the huge list but any help would be appreciated