If you are going to spend that sort of money on a jetski (which personally i despise as 80% of people that i have interacted with on the water with jetski's are complete aqua bogans - just tear up the water and drive dangerously close to other water users), why not get a boat?
We have a solid ski/wakeboarding boat for well under those $$$ - its an older model, but is still 270HP, can fit 7 people and puts up a wake the size of more recent boats that cost $70 000 plus. Very quiet inside, and the wake flattens out at faster ski speeds for slalom skiiing.
I just think for a family that a boat is a much much better option as everyone can enjoy it.
This is our boat below - we have about another 5 families that regularly join us for days on the river. Its an american built Ski Nautique and way better quality build than any Aussie boats
We have terrible problems in Vic with jet ski operators.
I agree with you - a family boat which you and the family can all enjoy together without having a huge impact on those around you... 
Marty.....we have a terrible problem with Victorian PWC operators in NSW (The correct term is PWC - Personal Watercraft. Jet Ski is actually a Kawasaki brand name that they hold the rights to) They are way over represented in our serious injuries and fatalities on the Murray River at places like Echuca/Moama and Mulwala. How many examples would you guys like? The Vic licensing systems is rubbish and we have been asking the Vic powers to be to bring int into line with the NSW licensing system/testing. PWCs are starting to out number ski boats now at Moama on big weekends like Australia Day and summer holidays.
Off the top of my head just this season.....young girl had a foot partially amputated after being run over by a PWC which resulted in her foot getting stuck in the intake grate. Two guys collided with a house boat last weekend - internal injuries. A kid on a PWC (who simply cannot be trusted riding a missile like a PWC) thought it would be a good idea to try to spray his mate who was trying to get back on another PWC. He stuffed up, hit his mate and squashed him between the two PWCs. Once again internal injuries and a broken leg I think from that one...that was a week or two ago as well at Mulwala. All parties were Victorian.
Anyway, it keeps me in a job and gives me a few trips down to Melbourne each winter to investigate the incidents.
As well as PWCs now being a pest on our waterways, ski biscuits are almost as bad and again feature heavily in the injuries and fatalities stats. e.g. 2011/2012 season, child killed after being whipped into a snag (tree) which was being towed by a PWC at Moama.
