I know a bunch of guys here in SATX that have used Marty Seidler in the past. I went the LLC route mostly because I needed to set one up for work anyway otherwise I was going to have Marty do it.
i have spoke with this guy before but didnt use him as a my gun trust guy, went with a guy in Dallas instead. No reason other than some other freinds had used the guy in Dallas.
Try Voeller Law Firm. http://voellerlaw.com/firearm-gun-trusts.php
I was refered to them by The Gun Shack. They used to have a simple/single person trust for 99.00(in your name only) and the full trust was 300.00.
Texas Law Shield does NFA Trusts.
Check with some of the dealers( the one your going to work with if possible) about who they recomend.