I bought a set of Winners Choice for my Cybertec I had a couple years ago and can't say a bad thing about them. Excellent quality. Yes, they are very expensive though, but if you shoot a lot, will pay for themselves actually.

I personally am going to venture into another maker this year. Wolf Den bowstrings to be precise. They seem like a very nice string and the company was very quick to respond to my questions. Pre-stretched and a guarentee against peep rotation and stretch. All this for around 50.00 a set. Not bad I think.