I have an 89 Sunsport. Without weight, the wake has been fine for standard tricks. I've had a friend out who knew what he was doing, and he was throwing down tantrums, so good enough for that anyway. With a little weight in the back, it's a fine wakeboarding wake. The ski wake is also quite respectable, although not the softest and butteriest out there.

It's about comps. If you pay someone 4-5k to fix the stringers, now you are in 8-9k boat. If the engine is solid, then you have to ask if you can get a better wake for <10k. I think that is hard. I tend to think that an older Sunsport with documented stringer repair runs 10-13k and a composite runs 12-15k. Zkdk3000 may be better at finding boats and negotiating than I am though. I think a composite MasterCraft or CC will also run 10-18k (maybe a little higher than the Supras). Here's the outdated graph of budget wakeboarding boats (http://forums.wakeboarder.com/viewtopic.php?t=59748).

The Sunport is also pretty comfortable with 8 people. And that's a real bonus on Saturday afternoons with the kids and their buddies.

How are the engine mount bolts? Do they spin? If they feel ok, run that baby this summer and see how you like the wake. It won't be as good as a modern wakeboard boat with all the fancy hidden ballast, but it costs a lot less. And with some fat sacs in the back, I think you'll be pretty pleased.