I know I am late to the party here but:
325i's were to bright for me (maybe I should send my pair to joseph69 for comparison?), they are just sitting in their box...
RS1i's were just, I don't know, 'off?' to me, something not quite right to my ears.
PS500's are the ones for me, with G cush.
I auditioned them all at the same time and the PS500 came out the winner.
Interesting! To each his own my friend. Everyone's ears are different so as long as you let them be the judge, you surely can't go wrong.