I would agree with: 1,3,4,5. the 575 is the ticket, but 460 would be second best. Deeper seats deeper boat, so far my only complaint is the B52 Alpha is the slow pumps and it sits too low in the back. I had a wave come over the back from another surf boat and almost swamp us when I was sitting still filling ballast. I had to drive just to start emptying ballast not to get swamped by the next set of waves.
I would love to have enclosed rear ballast like the supra, my buddy has a ton of room for gear in the rear lockers on his SA.