Hey guys, I'm new here and if there's a separate recommendations thread/forum and i'm being an ******* by posting this here, seriously sorry. Anyway, I have a fiio e7/e9 combo im using to power my Ultrasone Pro900s. I listen almost exclusively to electronic music (trance, house, electro) and am looking for the next logical step in upgrading the amp, DAC, or both. I have about $400 to spend, not including whatever I can squeak out of selling the e7 and/or e9. Any recommendations? Thanks!