Before I started using the IG Speed I was using Flexpoint Radical OS's and I loved them. I've also played with the Ti. Radical OS's and a bit with the i.Radical OS's but the Flexpoints were my favourite.
Racket/String: Head Youtek IG Speed 18x20 / full bed Luxilon ALU Power 16L @ 52lbs
(Soon to switch to the Six.One 95 18x20 w/ gut/Alu Power hybrid!)