OH MY GOD. All i can say right now.
Yesterday some SR325i's and an Apogee Duet turned up at my house (new headphones and source in the same day 8) nice). It's amazing - added SO much more detail and richness to my setup! I'd heard the SR325i's were rather cold and analytical, and while they have ridiculous amounts of detail and are incredibly accurate, I find them to be warm, thick, fat, and revealing. Brutal to bad recordings they are, and uncomfortable they are (as with all grados, except these have aluminium alloy cans, so are heavier on the head), but never have I heard ANYTHING so revealing and true to the recording.
The SR80s will still be getting a lot of headtime, as they sound more 'fun' with any genre of music (kind of like there an e.q. dialed in), but thats not to discredit the 325s which sound delicious - as I speak I'm hearing background guitar passages I'd NEVER noticed before in an album which has a playcount of 48 on iTunes!