My choice would be #4 and #7. Ridden in both, not bad. You will need the engine snorkel and water proofing of many components if you really want to make it fool proof.
Just get this and leave everyone behind:
http://www.gibbstech.com/aquada_ski.php
"It is a great beast. It drives fantastically well on land and then it turns into the most remarkable boat on water." Sir Richard Branson.
It was the stuff of legend… a high performance amphibious vehicle. People around the world have aspired to it for a hundred years. While there have been numerous attempts to make a vehicle that could travel on water and land, nobody has made one that is actually very good in either environment - until now. The Gibbs Aquada offers uncompromising performance that blows other amphibians out of the water and leaves them floundering on land.
The Gibbs Aquada is the showcase vehicle of Gibbs High Speed Amphibious (HSA) technology. The award winning engineering is highly sophisticated but the end result is a simple and seamless experience. On the road you get all the handling of a sport scar. Getting into the water is as simple as driving down a boat ramp or beach, and pressing a button. Within seconds its wheels tuck gracefully under its body, the front of the car lifts up and you're planing at 30mph, leaving an elegant arc of spray in your wake.
No wonder the Aquada is so often compared to the submarine car in the James Bond film The Spy Who Loved Me.
Your neighbor loves his convertible, his son is impressed by transformers, but take them for a ride in the Aquada and show them a truly convertible vehicle that transforms itself from sleek sports car to jet propelled speedboat. With the new Aquada you will be making waves both literally and figuratively. The distinctive styling is instantly recognizable, and sometimes you just don’t want to blend in.
