In current production...RS1i. Classic representation of the "Grado sound".
I haven't heard the RS1i, though I used to own the RS1. I've noticed, however, that the "i" versions of 2009 have a "house sound" that is more like the HF2 and PS1000. It's punchier, at least on the SR60i, the SR80i, the SR225i and the SR325is. If that's also the case with the RS1i (and why wouldn't it be?) then that has got to be a headphone worth hearing.
Missing from the list.... Grados modded by Bilavideo!
You flatter me, sir. Thank you. When I read through his list, I wanted to say something like, "My favorite Grados are the ones I've modded," but I didn't want to sound cocky. It put some wind in my sails when I read your comment. Thanks for that. Truth be told, I like the modded Grados, which allowed me to adapt the cans to fit my personal needs and values. When fully modded, there isn't a Grado I don't like. The cool thing is to realize we have the power, at our own disposal, to take ownership of our equipment - and to make it serve us better.
Aren't those mods gorgeous? Larry has been a tremendous inspiration. He's one of several out there who have shown us what a Grado can be, if you care enough to push the envelope.