I have been on all three, but not on water. Donzi hands down. Those speeds for the Donzi are for twin 496HOs, if I remember right. I know you can get one built with 500EFIs, and I bet you can get 525EFIs.
Offshore-Performance.com has a VERY NICE blue 39ZSC, on the lot I am sure they would be happy to sell you. I am pretty sure it has 496s.