I lived on a lake, actually still have a lake, and every day after work I would burn a tank through it. That was of course when gas was well under $2.00.
I had a TS650- it was ok, stable as all get out, but my sisters still flipped it.
An HX 720 and it was a fun ski, but I got too fat to get on it
Still have a Seadoo XP, 93 WRIII 701, 2 650 SJ, and a FX1. The FX1 is my absolute favorite, it was a demo, I bought it in 1999 brand new as the dealer couldn't sell it. It has been bulletproof. I bought mine and my friends rode it, and they went on the quest to get them. Basically it is a JS550 hull, with a 701 engine in it. If you can hang on and find smooth enough water, it will run about 53mph. With a stock engine.
Just pipe, cdi, and prop.