I agree with many here. I bought my GS on the way back from Baghdad moons ago...I was in the same situation you were in, shopping from a deployment.
Based on what you say, yes, a GSA may work best for you (though I like the GS more 'cause I'm short). I love the KTM but it is a more dedicated machine, meaning it's more like a sportbike on a dirtbike suspension, fast and very offroad capable.
Definitely check the used market constantly.
My TAT trip will hopefully bring more attention to the need for more Cancer Research! Please go to http://www.gofundme.com/bxkt74 and check it out! No money goes to me or family, all to cancer research! Please donate at the location!!! Thanks!