welcome, outpost and thanks for your service.
here is a link to faq page at usa kilts. it is a good comparison of the different price ranges of kilts available. regardless of what kiltmaker you ultimately choose, the lower range kilts don't have nearly the variety of tartan choices as a higher priced wool tartans, and in your case if you're going for the kirk tartan, you will probably need to aim a bit high as i'm doubtful that that tartan is available in less expensive fabric such as polyviscose. best wishes.

http://www.usakilts.com/store/cart.php?m=content&page=6