I'm also rather certain tallan is playing a Psion, so you guys will have a controller, too.
Don't get too hung up on the roles since I can adapt things around the group. The game I run on fridays has anywhere from 5 to 8 players each week, half of which are strikers or secondary-strikers. The first set of players didn't have a single Leader, so I just gave the group a couple extra healing potions to start with, and they managed just fine.
Play what's fun.