Hello Joyinc!
I think the Ninja 250 is a great choice as a starter/learner. The 2008 and 2009 models are updated from previous years. There is a full-length review on these newer models on this site to give you an idea of the changes. The older ones seem to have a more upright riding position for what it is worth. Buying used is a good option in terms of cost, plus you will not mind as much if you end up dropping it. I think santacruz rider’s advice on having someone with you who knows bikes or getting a mechanic/dealer to check it out before purchase is very sound. Plus, if you want to move up or buy a new 250 later, you can sell yours without taking too much of a hit from the depreciation.
Here is a good site for 250 info:
http://faq.ninja250.org/wiki/New_Riders
There are a quite a few textile/non-leather options.