Had a fitting yesterday at Sand Martin's Golf Club with Chris Courtneidge from Titleist for a set of irons. I've met Chris before and have to say he's the consummate professional. He always asks what you want from both the fitting and your irons rather than what he wants!
Currently playing 716MB's and although I love them realise that I'm getting a bit older and not practicing as much so a bit of forgiveness wouldn't go a miss. I'm using KBS tour stiff shafts as well and thought a lighter shaft might help as well but we found they were spinning too much; so much to my surprise after trying quite a few options stuck with the original shafts and have gone with a set of CB's 4-PW.
I did consider a mixed set of CB/MB's but the CB's went so well, 8-10 yard gain and better ball flight so have gone for the full set. Let's just hope I don't have to wait too long for them now (will have a set of 716MB's for sale if anyone wants them).
So if you're based in the South and end up being lucky enough to be fitted by Chris, you'll have a great experience, he's very knowledgeable and makes it fun as well.