Current/former marines: what is your MOS and what do you think about it?

During ITB I got bilateral stress fractures and the doc is saying that I will probably have to change to a non-infantry MOS, because infantry would be too strenuous considering my injuries. The problem is that I haven't looked at any other MOS and have no idea what to choose. My GT was 135 and my ASVAB was 96, so I'm looking for an MOS that is at least somewhat mentally challenging. Thanks for the help guys.