For clear flylines, I fish Airflo Tactical. I like them, they cast great during summer weather, but tend to coil during cold conditions. The only problem I've had with them is that one of them broke on me. It is the only flyline that I've ever broken. I don't think the mono core is as strong as the dacron core of more tratidional flylines. I broke it while stretching the line to remove the coils. Probably pulled too hard!
Mark