Trumpet, saxophone, or clarinet?

I'm a 7th grader (8th in September), and I play the trombone. I'm pretty advanced for my age and experience and my band teacher actually gave me a recommendation to join the high school band. Don't get me wrong, I LOVE the trombone, and I'll stick with it until the day I die. However, this summer, I'm getting the opportunity to learn either the trumpet, saxophone, or clarinet. They are all either free or very cheap, and I'd basically get a month or two to play around with it, then actually get formal lessons from my band teacher once I get back into school. Which one, in your opinion, would be the best without interfering with my trombone playing (ie: I heard somewhere that learning trumpet might mess up my trombone embouchure...?). Thanks!