Hi, everyone. Number 5704 here. Brand new pair.
I had the 125's for quite awhile, then jumped to the GS1000's. I didn't like those at all (WAY too much bass and recessed mids, a presentation I didn't like at all). When I returned the 1000's, I decided to go to a local dealer and listen to the rest of the line. I put on the 325i's, the RS2's and the RS1's. The RS models are super-lightweight and look great, but I found they had a "laid back" quality I was not digging (but definitely better than the 1000's, which to me don't even sound like a Grado phone). The 325i's just stood out to me: a very super-detailed and open sound, with alot of energy and dynamics. Some people think they are "too forward", but not to me. They sound in control and punchy, with a clarity that I think surpasses the RS models. I may one day get some RS1's for when I might want a different type of presentation (and less weight on my head!), but the 325i's are my top choice right now, given my tastes today.
Speaking of different types of presentation: I have been experimenting with the "Grado flats" from TTVJ. Interesting. Not sure they are to my tastes exactly, but they do increase the bass, and have a very "tight" sound. Maybe too tight, which tends to decrease the openness of the sound and it sounds a little muted. It still grooves, though. Anyone else try the flats?