Nailknot, I knew I always liked you. You sound like my type of guy. When I'm healed up, you got a ride in any of my boats. LOL.
But yeah, truthfully speaking (and have said this many a times) there is no one perfect boat out there. Especially if you do alot of different fishing (like myself). I was in process of buying a new Northriver sled before my shoulder went out (had just sold my older smaller sled). But at one time I had a DB, sled, couple 14+ catarafts (mostly whitewater, but had some fishing frames for them) some smaller catarafts (under 12') that were all standup fishable on the move. Couple float tubes, and a small pram. All had their plus and minuses. But none have it all. My old sled was good for the salt, lake, and rivers. But not all aspects of that. For small lakes, small rivers, etc then I varied up the boats I used. From what I've read, I think you'd be best off with a glass driftboat. I love aluminums for pulling plugs all day. But if you flyfish only, you will be more then happy with glass.