I'm thinking along the same lines, except I will probably ante up for a pedal model, like the Hobie Mirage (more $) as you can move the boat and keep your hands free.
You can get small fishing pontoons fairly cheap, and some have decent features. Some could even accept a small trolling motor, if desired. Fly fisherman seem to do pretty well with inflatables, but if you fish with lures & treble hooks, sooner or later a fish shakes its head at the boat, and punctures the boat with the hooks. I knew of one guy who had his boat sunk by a striped bass
