What type of music do you mostly listen to? I have an Imod feeding either a Ray Samuels XP-7, a Tomahawk or a Jasmine T200 tube amp depending if I'm at home or on the move. I listen mostly to jazz.
In my opinion RSA amps are not like you describe them, they are not "rock" music amps. They have very well defined highs but not harsh at all, once you listen to one of them I would be surprised if you would say you need something warmer/darker. They are a bit "analytical" sounding but have very smooth mids. For IEM's, it depends on your budget but the Vmoda Vibe is pretty good for $100, if you are willing to spend more $$$ then the Shure E500 are great.
By the way, if you go Imod, go for a good amp and cans if you want to see what the Imod is all about. If you go for a cheap set of cans and a cheap amp, you will probably just find that the Imod is a bit better then your old Ipod. When you read over at Head-fi that people find the Imod an incredible improvement over the stock Ipod it is because they have the other components to resolve the improvement the Imod brings. I've seen a post there the other day where a guy said he couldn't ear much difference between Imod and Ipod, well either he was listening to badly recorded rock or his amp/can was very low-end.
Hope this helps.
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I listen to a lot of mids-rich music. I didn't mean to imply that RSA amps are bright and fatiguing, all I was saying is that given the rock-heavy bias of Head-Fi, a "warmer and darker" amp would probably fit my listening profile better.
FYI: at work I listen through Grado SR-80s...which are at the limit of my brightness tolerance.
I like musical, not analytical sounding amps...yet at this point the two top contenders for me are the RSA Tomahawk and the Corda Move.