Keep in mind that if you vote in the Texas primary, you are ineligible to put a 3rd party candidate on the ballot later.
A third party candidate won’t win this presidency if he isn’t in the race already.
I do recommend that after the 2008 election, all conservative Republicans find some conservative party to shift membership to and end this farce that is the GOP filled with RINO Democrats. Become a 3 (or 4) party nation.