Are there any textured strings that keep their texture for any real length of time? I used to use Prince Topspin and now I have Babolat Razor Spin, but they both lose their texture after a couple hours of playing and then they are pretty much like any standard synthetic gut. I want a string that is textured, or otherwise good for spin, that will retain its spin-imparting capabilities for a longer time, and hopefully reasonably priced too. For those of you who use Topspin, which do you use? guage? duraflex?