Welcome to NWKA.  There are many of us that do a lot of fly fishing from the kayak.  You are going to have a blast.  One thing I learned was it is almost harder for me to stand on the kayak to fly fish.  At least with a pedal drive, the fly line would get caught up in the pedals etc.  Fly fishing from a seated position, keeps the line coiled right in from of the seat.  Things may be different for you, but something to keep in mind while looking at different kayaks.

As far as picking a kayak, I would suggest going to one of the demo days that many of the kayak shops offer.  The Hobie Revo is a great kayak and would be faster than the Outback.  I have had both, but use an Outback because has much more storage options.  Both are very stable, but have a very different feel when on the water.  Happy hunting and hope you find just the right kayak.