Long time lurker here but thought i'd post seeing as how I will soon have 5 pairs of Grados.
On the way to me:
RS-1 (with the buttons, semi-vintage i think????)
Not sure if i will keep all 5 yet. I'm kind of hoping (and kind of not) the RS1 can replace all the SR series, and I am hoping the PS500 gives me everything the RS1 can't while maintaining the Grado sauce.
Smart move, i think that the RS1 are a good complement to the PS500, that's like having your cake AND a glass of milk, and if you're satified with this combo, you can even sell you're SRs and get some money back, win, win.