I took out my E500s this morning and did a quick comparison for you between the Tomahawk, micro and my current favorite, the Portable Millett. Of the three amps the Micro will give you the most spaciousness and airiness. I did a comparison between the headphone out of a 5G Ipod and the same signal with a micro and the micro adds clarity and spaciousness. The comparison between amps was done with my 4G Redwine Imod. So, for what you want the Micro will do it in an excellent way. As for tubes, they are excellent with classical music. The portable millett is fantatic with classical music, the tube signature gives me the feeling of being in a concert hall; somehow to my ears this amp seems to give the impression of reproducing the room ambiance and air surrounding the performers, which I really like. This is also true of jazz recordings, everthing sounds very natural with this amp. The Micro is not far behind and has a kind of a tube signature also, and it is very open and clear without being in the slightest bit harsh. For the money you get a fantstic sound, although the wait to get one is difficult.