I have a theory that the SR325i might be more like the MS2i than the SR325is. I had the 325is, and it was bright enough to peel paint. But I absolutely love my MS2i's in spite of the fact that I also have HF2's and RS2i's that I also adore.
I have a buddy whose ears I trust almost more than my own. He has the goldie 325i, and he swears by them. I know he wouldn't have liked the 325is that I had. I've never heard the "i", but I know the consensus seems to be that the "is" and "i" aren't that different, but maybe they are?