My ENT surgeon suggested I have mine done too. He wanted to do it all at once back when I had my tonsils/adenoids removed. I went and got a 2nd opinion and the other ENT surgeon told me just do the tonsils and adenoids and see how well that worked first. I decided against the septum fix.
I can actually breathe through my nose now, and I sleep a lot better too. It was my adenoids blocking the air and my tonsils giving me constant problems so I won't bother with the septum.
If you can't breathe through one side at all then I can see why you need it. I hear the septum fix hurts but I have no idea how bad. Just make sure they give you strong drugs and you'll be fine.