My Headphone Tierlist - V2

Added Sony MDR-V900HD. S: MDR-V6, MDR-7506 A: SR60, PortaPro, MDR-V900HD, MDR-V600, ATH-M50X, ATH-M50, MDR-V700, SHP9600 B: KSC75, ZSN Pro X, ZSN Pro C: MDR-V900, MDR-V404, MDR-V4 D: Stellar, MDR-V1 F: MDR-ZX110, MDR-V250, MDR-V150