finally deicided towards the 909, I found a used 909 D3 9.5 degrees in excellent condition with a Fujikura Rombax 7Z08 stiff for $140 on ebay. This club is superb, excellent penetrating ball flight, super long. can't be happier. This combination is what I was after and it would have been around $500 to have it new in a 910 since is considered an upgrade shaft and they upcharge you for it. I'm not going to have the possibility to tweak it, but I think I can deal with it.
I agree with the notion other posters have made that the swing is ever evolving and down the road your D3 possibly may no longer be the proper fit that it is today. The nice thing about what your doing is once it becomes time to make that change the 910's will be more prevalent in the used club market and you can shop around for the 910 and save yourself some $$$ and you hadn't sacrificed a thing since your D3 is the right club for you today. Well played!