Pro 900 is amazing, atleast try it. With the 'Kees' mod I prefer it over the 750 (finally got a chance to listen to them, and they are indeed good headphones) and the ED9 (though they are in a way not comparable).
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H1: NAD C542 / T.C. Electronic Konnekt 8 -> SPL Phonitor -> [B] AKG K1000
H2: NAD C542 / T.C. Electronic Konnekt 8 ->KRK VXT 8's
Headphones: Sennheiser HD-650
P1: Archos 605/iPhone -> Qables -> Corda 3Move -> Denon AH-C700 (T400 tips) // ATH-EW9 / Etymotic UF5
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