Count me in as a third, I too had a 750, and now I have the Z-7.
Dave, I learned a lot in that boat, it gave me the confidence to make the jump up the foodchain. If it were not for these big open lakes here in south Texas, I would not have changed boats, well maybe not! You will love the size, the storage, the trailering, it is a great package. With the Opti that thing should sip fuel. Not sure what the Opti will do, but I ran a 22p Quicksilver on mine and broke 48mph on the GPS. Probably could have gone back to the 21p and run faster, but the holeshot was great.
Good choice, enjoy!