I bought a 05 F-12 for my wife early this year, and she loves it. It is a lot of fun to ride, and the gas mileage is awesome. I go through 2 tanks on my RXT ans she will still have a 2 bars left. Ski has plenty of power, pulled tubes and skiers with it, and it spins and slides around like my old 96 sea doo. The only downside I have seen to the ski so far is it doesnt take the choppy lake erie waves like the sea-doo does, but other wise I would buy another one.
There are a lot of guys getting some great deals on untitled 07 and 08's, if you can find a dealer that may be a route to go.
Good Luck