Revo11 owner and previous Sport owner here.
Here are 2 vids of me sailing the Revo11, first without stabilizers and the second vid is with them:http://youtu.be/NVRbX3T2NQAhttp://youtu.be/5mUWJeADFrI
From that you can get an idea of speed (top speed maybe 4mph?), and no, its nowhere as fast as an adventure island, sorry.
I never sailed my Sport, so I can't comment on that one.
Spring Creek Stabilizers can be brought up against the kayak hull like adventure island amas, I do not think thats an option for Hobie Sidekicks, so not sure about the storage aspect.
A paddle on one side and a sail on the other MIGHT interfere with the typical placement of an anchor trolley. However, since I don't use one, take that with a grain of salt.
As for your intended purpose, you've told us fishing and sailing, but how much gear do you carry, how far do you travel in your kayak?
I have fished SE Florida in the Sport, Revo11, and Outback: the Outback is the best for carrying gear and offshore fishing, the Revo is fast and agile but a bit tippy in rough conditions, and the Sport is like a junior Outback (2 less rod holders, less capacity, but just as stable). Actually, I'm 5'8" and 210lbs and if I was your weight, I'd probably still be using the Sport for near-shore excursions and the Outback for offshore fishing. I do however, love sailing the revolution and will probably upgrade the 11 to a 13 next year.
sorry if I'm rambling, i don't think you can go wrong with either actually.