I think it's handy to ask all three, because some people take longer than others and you never know when a school might require three or allow three, instead of two. That said, the second one seems to be the best choice. He knows you well, and if it was a difficult class, than perhaps he could attest to that in the rec.saying that despite the difficulty of the class, you received an A-, a grade that was in the top 5% of the class. From what I've read, adcomm's enjoy that sort of reference because it gives them an idea of the difficulty of the class and how you compare to other students at your school. Good luck!
sorry just saw your thing about honors thesis. From what I understand, they are a decent soft. Depends on the school of course, but adcomm's seem to like them because they show that you can work independently, for a length of time, on a large project with great depth. I think an Honors Thesis has a lot of skills that are going to be relatable to law school.....