First off, two quick tips on how not to choose:
Don't pick the one that looks best in pictures - motorcycling is all about science. Yes, it's surprising, but something as cool as motorcycling relies heavily on something as geeky as physics. Just because you've read great reviews on a bike on bestbeginnermotorcycles.com and ourlittleadventures.com, doesn't mean its perfect for you. Ergonomics play a huge role. Dimensions, size, space, weight, all impact different aspects of riding. Sit on all of the bikes you're considering for a long time.
Don't pick the cheapest motorcycle - occasionally there are great ways of saving money, I've blogged on my site about tips for saving money at a dealership. Look to find ways of saving your money, don't start off by looking at what the cheapest thing available is, you get what you pay for. Buyer beware.
Second, let's look at what bikes are available in this class: