GZ 250 or TU 250?

[Gidget]

Hi! I'm buying my first bike in the spring, and can't make up my mind what to buy- can you help? I'll be using the bike for commuting to my second job about three times a week, which is 100 miles round trip. I can take the highway or back roads. I am trying to decide between a 2003 GZ250 with about 2500 miles on it (good condition, $1400), or a 2009 TU250 for about $3000. I learned how to ride on a GZ, but am tempted by the TU for the fuel injection and the fact that it's a newer bike. I am NOT mechanically inclined, and wonder if the fuel injection vs. choke would be a good thing for me. Can both bikes handle the highway? I'm on the small side (5'3" and 115) and want to make sure I can handle what I get.

Thanks for your input!!