I would like to switch strings from RPM blast 17g. I saw another thread suggesting Genesis black magic and signum pro tornado and the signum pro hyperion. I wanna know which has the best pwer, and especially POP. Additionally, I would like to know which string offers the most spin, preferrrably an octagonal shape. If anyone knows of any black-colored (preferably but any dark or blue is fine) that fits the above description plz let me know. BTW i use a Babolat Pure drive roddick plus(cortex non-GT) and am planning on getting a Aeropro drive GT plus with the new strings THANKS ALOT!!!!!!