Ok, so I loves me some SR225i! They are fantastic and think that they, as well as the 80is, pair beautifully with my TBH (although I haven't tried other amps, I don't feel the need too with these cans.) I know that I am going to want to upgrade at some point here, and have decided to stop reading reviews for other cans because I continuously change my mind. I want to stick with Grados, so I am going to decide between the RS2i and RS1i. What I am hoping for, is someone to tell me the strengths and weaknesses of both. Know that I listen to Metal and Rock 90% of the time. Also, I would like to know of an amp and dac (doesn't need to be a amp/dac combo) that pair nicely with these cans. This will be my future rig. Thanks ahead of time