I've heard 5 different SR-325 equivalents. A pair of MS-2's, 325i's, the original black 325's, the silver 325's, and my woody 325's. The MS-2's, 325i's, and silver 325's all have very similar sound, almost to the point that they might just pick out the more neutral drivers for the MS-2's. The old black 325's sounded lifeless and distant. Mine are warmer and faster(better low level detail and punchier) than any of the others. If I had to get a new pair, I'd probably go with a recabled MS-2, but any of them would work other than the old 325's. I haven't heard the MS-1's or MS-Pro's, but I wouldn't be all that surprised if the difference between the Allesandro's and Grado's is determined through driver matching instead of tweaking.