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.