I picked up a Fiios E-11 amp and a set of the Martin Logan Mikros 90s. Each cost 60.00 online. This is an awesome amp, and the MLs just came alive with it. I've burned them in for about 20 hours. Incredible depth and presence, and I have never used a headphone amp before. The eq settings are actually useful. Together, this setup is a great value. I bought in anticipation of a Pono player this fall, and making DVD-A ALAC rips has revealed nuances I have never heard in some songs before. Little things. The hum of a studio amp. A pick being dropped. Dialogue before a song starts. A great example: "With Our Love" from the Talking Heads "more songs..." I heard this sheet of Brian Eno synths that was always obscured to me and I have been listening to this record for 35 years!
So, for bang for the buck, this is a great combo and I'm really pleased that I can re-experience my music for only $120.00.
However, the 6" 3.5 mm cable that Fiios supplies was defective, and crackles and hums. I switched sources to ensure that it was the cable and the problem followed. I emailed Fiios, and they told me that the cable was not covered by the warranty, but would make an "exception" if I sent them $5.00 for shipping. I find this to be terrible customer service, and although I'm going to keep the amp and just replace the cable, I find Fiios nickel and dime attitude to be off putting. So, off to monoprice!