Get the D8 and go to maybe a Rico 3 or equivalent reed. I had a squeaking problem playing on a D7 and went to a D9. I had to go down from a Rico 3.5 to a 3.0 because I couldn't control it as well. I only use the alto on 2 tunes my band does. If I've been blowing it out on Tenor all night, it gets hard to play on something that open with a stiff reed. I use Rico 3.5s and play on a D8 tenor. I have been doing that for over 3yrs now. I prefer the cheap orange box reeds. They seem to work the best for me and I can usually get the ring I'm looking for in my tone.