Either Robbe or Graupner makes a Seadoo thats rather well sealed, and uses twin contra-rotating props for a drive, another model that uses a water-jet unit. There is a cheap copy of same, seen it for sale on the Mato-Toys site (
www.matotoys.com)
Personally, I'd go for something along the lines of a Graupner B24 (that sleek eco-stealth hull) or the copy... if it noses into a breaker, nothing to rip off coming out the other side.
Then again, I'm partial to big... had a Graupner Portofino with twin strudder drives... could almost completely beach it, and still back it off again. Can't wait to see what my 'revised' Dumas 'American Enterprise' can do (52" ocean drill rig tender)
Look over the Enterprise and the Dauntless if you want to build it up, or Grapuner for an ABS hull/deck and great drives. Used, check out the RCU sales area, of course.