I would like some opinions on the three I am looking at right now, thanks.
http://springfield.craigslist.org/mcy/830066724.html
Three very different bikes you are looking at that's for sure. Of course I'm partial to the 250 but with new tires, battery, clutch cable, and service. It has a lot going for it even at $1600 assuming they wont move from that number. Book on that year bike with the miles is ~$1700 there may be other things or they don't know the value.
Regardless of which bike you go look at check this url for some tips on looking at bikes. (
http://faq.ninja250.org/wiki/What_do_I_need_to_know_about_buying_a_used_bike?)
I highly recommend the 250 as a first bike. When set up correctly it is a great bike to learn on and lets you focus on developing skills and not about what the bike may do if you twist a little too hard with the right hand.
And since you said you were new to bikes I would be remiss to not bring up two things that are more important than the bike you end up getting; 1) take a MSF course as soon as possible, you will never regret it and 2) protective gear - helment, jacket, gloves as an absolute minimum boots and pants round it out. The site I gave you has a lot of great information.
Welcome to KF. Search, read, ask, and enjoy.
Keep us posted on how things go.