http://www.searay.com/page.aspx/pageid/160944/pmid/366038/SDX-270.aspx
Sea ray 27' boat.
8'6" beam, 5659 dry weight
300-380hp
I would think if sea ray could do that, Yamaha could do it cheaper and lighter with jets.
Probably still about 5000 lbs.
It would certainly be worth some of the small upgrades like intake, filter and anything else to make it stronger and more fuel efficient.
This sea ray listed at 100,000 depending on options of course.
The Yamaha would need to be 80k to really be competitive.
Top speed of the sea ray with 300 hp was 44 mph according to boattest.com
The Yamaha with twin 180 hp would probably be just about there but maybe faster if they can keep the weight down.
If they do something like this sea ray, I would need a few more years to see what my kids like more, cruising or surfing.
If it looks like we are going the cruising route, I would probably purchase slightly used pretty quick.