I'd be interested in one farther north. Fort Collins/Loveland/Greeley area.
Though it doesn't directly answer your question, I second the Fort Collins/Loveland/Greeley area. The Denver area just doesn't work for me often enough.
Both Curt and I are in Thorton and Northglenn, which is the farthest north area of the denver / metro area. There might be a good place half way that we could always meet to trade out some plants. I generally have a handful of ludwigia 'cuba' available And once my bush gets to a nice size some rotala magenta, and rotala rotundifolia 'green' all three are monster plants that grow very very quick in my tanks lol