It's early to actually pinpoint what load out you are going to prefer; however, I can make some suggestions. As a Titan, you'll be up close and smacking Fallen captains around so I suggest a light machine gun as your main (something like the Thunderlord from the e3 video from last year, but not necessarily an exotic weapon) and the silver dollar shotgun (or equivalent) in your special slot. You're going to be up close and kicking butt with your fists of havok and bubble shield. Go get em! Destiny Awaits.