The Turbofins are a "performance" upgrade because not everybody has bicycle legs. My wife, for example doesn't care for the Turbos. So "regular" fins are a reasonable starting point for many folks. It's nice to have choices. Maybe your dealer could throw in a set of Turbos as part of the deal?
The standard and fishing models are identical except for color choices. For the extra dollars, the fish models add a few trinkets which you can get separately as accessories if you want them.
If you end up getting two kayaks, consider two different models. When you go out by yourself, you'll have a choice. When you go together, you can take the slower one (presuming you're faster than your wife) so they're will be less disparity.
You'll find each model kayak has its strengths and weaknesses. IMO, the Adventure is the king of distance and speed, but the wettest ride and the least maneuverable. The Revolution is the newest and most versatile -- does everything well, but the best at nothing (though possibly the best at sailing). The Outback is a great utility kayak, a favorite for fishermen, but a little slower and weaker at paddling. The Sport is lightest, easiest to transport and launch and most maneuverable, but slowest and has a smaller weight limitation. So it depends on your priorities.
The '06 models cost less than the '07's, and there are some color changes for '07. Additionally, the kayak business slows down in Fall and Winter, so you might be able to get an additional discount from a dealer with excess inventory. The Revolution is new for '07 though and the Outback hull change for '07 makes it a easy choice over the older ones.
Dueitt2s' advice is right on target. It's nice to have a local dealer in-case you have a problem. It's also a huge advantage to try out a product first rather than taking someones word on it. It's your $!