I agree Eddie. If SRAM is fitted go with it, but don't pay £300 for a cassette. Over the years I've had SRAM red, XT, XTR etc. MTB wise i'll stick with XT, as XTR isn't worth the extra £ vs weight IMHO.
Roadie wise i'd stick with dura ace 9000, maybe even electronic. Can't believe i said that...