I didn't read this whole thing.
I started on a Kawi 750 (ZR-7) which is not much different from the Nighthawk. I too considered one and I really liked their looks, but as has been said, reliability with something that old will be an issue unless you're lucky (often times parts braking leads to people selling their bikes).
The problem with the 750's come down to weight and power. The midrange on these bikes hit fairy stout (especially for a new rider), and the weight will keep you from learning with the bike as you should. I recently transitioned to a 600 sportbike, and to me, it's much more well behaved in the sense that I really have to ask (downshift/rev the crap out of the engine) to get power out of it. On the other hand, it does almost 160 and wheelies by accident (the power is very deceptive).
Regardless, I know what you're thinking, you don't want one of the 500's because of looks (although naked they're alright and the GS isn't so bad). And also it would be nice to have a starter bike that will keep you happy down the line.
You will probably drop the bike, so the more you like the way it looks, the madder you're going to be when you go down.
With your height, you definitely want a starter that sits in the tourer/city bike kind of category as the riding position takes some getting used to. And the more comfortable you are, the more you will ride and the faster you will learn. This is why I would stay away from most faired bikes/anything with clipons.
Consider a late 90's 600, especially a naked. FZ6, bandit 600, etc unless you are willing to try a 500.
If I was to start out all over again, it would be on an '08+ 250r. They handle great, they look great, they're sporty enough and you will probably want to end up keeping it since it gets over 70mpg for running around town.
By the way, here are some ideas in your area (I didn't go through them individually)
http://kansascity.craigslist.org/mcy/1792113405.htmlhttp://kansascity.craigslist.org/mcy/1787719071.htmlhttp://kansascity.craigslist.org/mcy/1776602140.htmlhttp://kansascity.craigslist.org/mcy/1767197764.htmlhttp://kansascity.craigslist.org/mcy/1764375689.htmlhttp://kansascity.craigslist.org/mcy/1766840358.htmlhttp://kansascity.craigslist.org/mcy/1757750401.htmlhttp://kansascity.craigslist.org/mcy/1777600103.htmlhttp://kansascity.craigslist.org/mcy/1796011076.htmlhttp://kansascity.craigslist.org/mcy/1788844436.htmlhttp://kansascity.craigslist.org/mcy/1791331327.htmlhttp://kansascity.craigslist.org/mcy/1771044821.htmlSome of these and others are probably a little too much to start with...just find some one older with lots of riding experience and take their lead and take your time and get to the track as soon as you can.
Oh yes and buy in the winter.