I would just suggest going to a custom maker. I use a few locally, and have also bought them on line. What is nice about this is that the string is made for your bow, and all of the serving are lined up correctly. There are good and bad about every material out there so you have to decide what you are loking for. Personnaly, I do not want a total no stretch string. Having a string with some elasticity is what I want, I also usually ask for an additional strand to be put on, it it less wear and tear on the bow. Talk to the string maker to get a sense of what you are looking for.