OP - these guys are steering you in the right direction. Don't waste your money on an expensive surf setup on your Sunsport. I have an 88 sunsport that i surfed for a few years with just ballast. The wave wasnt great, but surfable. This summer i spent $20 on a home made surf gate and it made a HUGE difference. I was surfing with a buddy who said my DD Sunsport with my home made contraption and about 800lbs in the ski locker was throwing a better wake that a much newer Malibu Wakesetter he was riding behind a few weeks prior. I have about $400 invested in ballast bags and fill pumps. Spend some time, not money getting your Sunsport set up and it will surf just fine.
1988 Supra Sun Sport 454 PCM
1972 Olds Cutlass 455
1998 BMW 750il
1996 BMW M3 coupe
1995 Toyota Tacoma 4x4