Roddy,
Which cat is right for you depends on what you want to do with it and how much money you have to spend. If your budget is less than $4K then your best choice will likely be a used Hobie 16. THere are lots of them out there and they are a good value if you are careful about which one you buy. If you have more than $4K there are some other choices you can consider.
I like in the Dallas area and I found that Craiglist seemed to have the be collection of choices. Here's the link to the Hobie's in the Dallas area but you should try other large cities like OKC, Austin and Houston as well.
http://dallas.craigslist.org/search/boa?query=hobie&minAsk=min&maxAsk=max
Hope you are back from Iraq soon!