Flintlock,
I think that a moderately fast action 5 or 6 wt, 9' rod would do what you are asking of it. For your comparison, I use a St Crox 9', 5 wt, model AF905 Avid (2 pc) fly rod for most of my larger trout stream fishing and small bass fishing. It is a moderate power rod with good line speed. It easily handles double fly set ups, or a dry fly on top with a small split shot and nymph under, yielding good distance and sure turnover. Since you will be casting from a boat, you can adjust the distance requirement easier than we can sometimes when wading, so consider a rod with good power for the solid turnover. One other note: While both weights will do the job for you, I will recommend that you give special consideration to casting in windy conditions, and to line choice.
The 6 wt will do better in the wind than the 5. This may not be a factor for you, but I thought I'd remind you.
I use a Scientific Angler's GPX WF Floating on the 5 wt rod. It has a short taper and strong turnover capabilities. I use a Cortland 444 Si ghost tip as a sink tip line when I need to. This rods does well with both. If I need 'delicate', I either back off the cast, or go to a lighter weight rod/line. SA's XXD might be a good choice for your application, or Cortland's 444 Lazer Line.
Hope this helps,
Tapper
