I'm a newbie to this forum, so please experts don't flame me, but I recently auditioned the whole Grado line plus the two top Sennheiser cans with my iPod Touch as the source connected to the headphone jack. The music was Beethoven - piano sonatas and piano concertos with Vladamir Ashkenazy. Of all the Grados, considering price differences, I felt that the RS2is were the best value/sound combination. Of course the RS1is were better, but, not enough, IMO to pay the $200 difference (in Canada). I also liked the RS 325is - again another $200 price difference, so to me it would depend on your budget. I have owned RS80s for 2 years and previous to those had Stax electrostatics (can't recall the model). If you can try the Grado line all together with the same music/source, i would recommend it. Good luck!