Tuna would be a sweet boat for you if you want to do it all. I'm 6'"3 210lbs and I paddle a tuna. A bit too small for an expedition but an epic boat all round. I went to it from a (newer) Mamba two years ago and wouldn't look back.
The 9r is epic as well. there is one niggly eddy on the kaituna that is a bit more effort to catch than most, in the 9r it was a breeze. Doesn't boof as well as the tuna but would be a better all-round boat I think.
Haven't paddled the newmad but I used to paddle a nomad and loved it.
You wouldn't go awry with any of them but for a colorado boater, I think you'd be stoked on the tuna.