Muay thai, boxing, or mma?

I'm not sure what martial art I want to pursue. I have been boxing for about a year, but never fought any amateur fights, so I wanted to try that. The boxing Gym is near by, and is 75-100 dollars a month. I have wanted to try Muay thai, it's very close to my house and only 45 bucks a month. But my friend asked if I wanted to go learn MMA for 50 bucks a month at a MMA gym. I also have about half a year of wrestling experience. What martial art should I pursue? I want to try all of them, and I know MMA trains all of the martial arts, but I want to focus on each martial art individually too. Help?