Picking an MOS starts with your score on the ASVAB. According to how well you do, the choices come from that. As far as Infantry goes, its a great job if thats what your into but as others pointed out, there are lots of Combat Arms MOS's that are not Crunchies that you could consider.
Shoot for the stars but remember, once you sign and raise your hand, thats what your gonna be for awhile unless you dont make the cut, then they choose for you! The SF' type jobs are very challenging to make it to graduation day, some lose most of their class before your pinned (if your pinned). Not trying to talk you out of anything, just bringing reality to the table for a second.
In 21 years, I had 4 MOS's other than our common Primary, 11Bang bang-Infantry; O5B Radio Op, 05C Radio Teletype Op, 92A PLL TAMMS Clerk and 11H-Anti Armor. I liked most of them pretty well, each had their good and bad points, each one was very different than the other. In the end, they all added to my potential Civilian Career Path in ways I had never imagined, mostly good.
Start by making sure you keep your nose clean and your grades as high as you can, those are the most important precursors to getting in and having real choices. Good luck,