I recommend that you get a second opinion with an ENT surgeon who does 3 dimensional CT scans. Also, tell your surgeon NOT to open up your maxillary sinuses (ie, make them larger). I had to have sinus surgery and I found out that one of the things that can happen if your surgeon makes your maxillary sinuses larger is that it makes you sound "stuffed up", like you have a small cold. Maybe it won't bother you, but it bothers me a great deal because I'm a singer. It IS better, almost 3 years later, so at least there's that, but I still wish I had known beforehand so that at least my ENT and I could have talked about it.
I considered my health, which was a real issue, MD. But I should have found a doctor who does surgery on singers. That's what I really regret, or at least knowing about the issue of not opening up the maxillaries.
One thing that you might want to talk about is the issue of sleeping. Some deviated septums can cause sleep apnea, and that can really affect your health a lot. I'd rather fix that than end up having to use a c-pap machine. The older you get, the more possibility of sleep apnea.
Good luck on deciding this. Sinus surgery isn't for the faint of heart.