KRK 6400 and an E7 would be my recommendation. Or possibly a better DAC. If you do that, though, you might as well just go with the E6, though the warmer E7 amp is still probably a better match with the KRK. My Emu 0204 + E7 as the amp is a nice neutral match for the KRK. The T50RP needs a lot of work. Wearing it for a while and then switch to the KRK is amazing. Not because the KRK should be selling for 10 times the price, or anything, but because the Fostex is so bad. The KRK 6400 does beat the HD280, MDR-V6, MDR-7506, HN7506, O one, O2, Ixos 1001, PHX, Fostex, and all the versions of the EX-29. I also like my modified HD25 and the ER4S, so consider the KRK in good company.