I'm thinking of getting a new Mathews Legacy and have been hearing about how Mathews strings stretch and the bow must then be retuned. Is it worth the extra cost to get the Tigertwist string initially instead of the Zebratwist, or should I just get a Winners Choice string in the beginning. I don't want a string that will stretch and then I have to retune, I'd like to get it with a string that won't stretch and be done with it. Thanks for the advice.