Vapor trails and Winners Choice are my only experience. Both excellent.These strings are creap free and prestretched so you can shoot without a rubberband on your peep and your peep is always aligned.
I would recommend Gibblet as well. Dan (MeanV) deals with VT strings I believe, so that's also an option. There are plenty of choices out there, however.
Some are pushing up close to $100 for the set before having them installed but you should be able to get a quality set installed for less than $80. As mentioned, check with Gibblet on his Bucknasty strings or with MeanV on Vaportrails.
Dan's customer service is as good as it comes, and I've heard nothing but good things about Vapor Trail strings. I just ordered a set from Dan for myself and my brother. His price was also as low as I've found.
I just ordered a set of Bucknasty strings from John,(gibblet). 452X with halo serving. Mountainberry and silver. Well under $100 for a very high quality string and great customer service.