Rodriguez seems to have upside potential. The Rangers are capable of putting up big run support and tend to do so often, which is why I believe he deserves the most consideration.
Byrd has experience, but Byrd might not bounce back so well. He's regarded well, but only really had two good seasons. I'm still not sure why *I* am big on him.
Thomas is looking great so far and I suppose it depends on if you need pitching or hitting. But if you're looking to raise your AVG I think the pitchers will catch up to him and he'll come back down to earth. In other words, you might have missed the best days of his average already.