I had an 18 foot IO Celebrity, and now I have a Jetski. The boat was a PIA.
Reason for the Jetski
1. You dont need to hook up a jetski to the truck in order to move it around.
2. You can go more places since you only need about 12" of water plus it is more maneuverable than a boat
3. Less to clean, less hassle, and easier to launch and trailor in a stiff wind.
4. Launching a Jetski by yourself is 1/10 the hassle of launching a boat.
5. Most of you time wasted with a boat will be waiting on the others that think you have nothing better to do than than wait on them to show up. BTW, dont expect any of those "guests" to help pay for gas, or help clean when you are done. Get a boat for you and your family, not for your friends.
6. With a Jetski, you can be off to the lake in 5 minutes, and if your guests dont show??? who cares.
For the above reasons, you can tell that I dont miss the boat. If you go with a Jetski, get a Yamaha. I have over 80 hours on mine, and I have never done a thing to it. I never bothered to get the "rape me" 10 hour service check from the dealer. If you can work on the Ram, this thing is a piece of cake. I did a lot of research on what to buy, and it was Yamaha hands down. My second choice would be a Kawasaki. Here is the link to the model that I have.
http://www.yamaha-motor.com/01watercraft/suv1200/info_frame.html The new ones are red. The 99 and 00 models are white and gold. This thing is the cadillac of watercraft. About a week ago, I made a 97 mile trip on the ski, and I didnt hurt a bit the next day. I carried an extra 10 gallons of gas in the storage compartments, and I still had 1/4 tank when I was done. If you want to go about 175 miles, you can pack an additional 25 gallons in the storage compartments (four 5 gallon cans in the rear, and 1 in the front), in additional to the 18 gallon gas tank. I get between 3-4 MPG on the water. This ski is the dryest ride on the water. I can be cruising around the lake for hours, and not get a drop on me. If I want to have fun, this thing will spin, and you can get wet. My 3 year old daughter rides in front of me on this, and I dont have to worry about water hitting her in the face. Since this thing is so big, it is also the smoothest riding Jetski on the water. I have ridden with other jetski riders who are getting beat to death by the chop, and I dont have a problem. BTW, This thing also maneuvers as good as a 3 person craft, and some 2 person craft, so dont let the size fool ya. This SUV will pull waterskiiers out of the water faster and easier than some boats. I have pulled a skiier, and I barely noticed them on the back. If you cant tell, I love this thing!!!
Whatever you do, decide based on what you and your camily will use and enjoy the most. Good luck.