I have owned the SR60i, and have a pair of SR80 pinks. Have also owned the 325is (chrome) and have mucked about with the 225 and 225i as well as the Magnum X.
I regretted selling my 325is a lot...the build quality trumps all of the other Grados, and the sound was well worth the upgrade.
I used an adaptor, but it wouldn't be a bad thing to reterminate or recable. That's the only mod you will ever need on them, unlike the rest of the lineup .
Speaking of...why have I not gone back to them? The modding bug...