dunlop black widow it has very good playability. I have a Yonex VCore 98D strung with black widow @ 22/21 kg ( 48/46 lbs ) . the playability started to drop after 15hours of play.
Yonex VCore 98D / Yonex VCore Xi 98 strung with full poly @ 46 lbs
Pure Drive Roddick GT / Pure Drive Roddick 2012 strung with full poly @ 55 lbs