Tommy, Dynemma doesn't stretch and stretch would not help with wear and tear on arms/shoulders. Also, any line will tangle. I'm pretty sure we've tangled my buddies frank rope before...
Tings, you absolutely cannot beat the Accurate jacket series mainline. I am on my 11th year, same rope. No frays. It floats. Its strong. Love it. I am not a fan of the coated dynemma lines, I like the old spectra better.