I asked elsewhere and one guy chimed in saying he's never had issues with JSP. They're on the low spectrum. They make other seadoo stuff, seems like they're trying to penetrate into our market. I think I've bought something from them at a bargain price and it worked out, but I forgot what. Anyway, head gasket isn't that huge of a job, I might give it a whirl.
Let me know what you guys have tried in the past.