I think the new Prince Beast XP should be on the list. To me it's a super comfortable (see SOFT) co-poly and it seems to hold tension very well. A couple of my high school players I've strung for are using it and they have about 20 hours on it and are still loving it. I asked them how it was playing and if they thought we needed to restring again and they said no, the love it the way it is right now.
Just for reference these are #1 and #2 singles guys that are competitive at the state level and play USTA.
I'm thinking of using it as a full bed in my YTek PP, but not sure at what tension. I'm thinking maybe 46lbs?
Head UTek Prestige Pro - Stringway ML100-T92