1. 750 for surf side is a good idea. Do you have a playpen bow or walk-through?
2. Z5 is top notch. It's going to be hard for my to buy another boat without one.
3. I like the idea of dual batteries for piece of mind. I like the jumper pack idea, just make sure it stays charged
4. I wouldn't use this feature but is a cool idea
5. I bought Monster racks to add in addition to my factory racks. Each holds one surf and one wake (the surf tine could prob hold 2 surfs). There are lots of options out there brand wise. I like what the value of the Monster racks.

Other ideas:

A. Do you boat at night often? LED's are usually cheap and a "neat" upgrade
B. Tinted windows - I love the way it makes the boat look
C. Of course audio (sub, tower speakers, amps, etc)