I also recently bought a pair of Grado SR80e, which I also like (I am a sucker for quality items made in the USA). They just don't have the low end the M50x do, so they are both suitable for different types of music. I am not sure which pair I prefer quite yet, but the ATH-M50x surprised me for sure, especially when used with my vinyl set-up. I like both so much I am keeping both. I was looking into the Sony MDR-7506 as well but when comparing in the store they sounded too flat for my tastes, and the non-removable cable was a deal killer, as I needed a long cable for my stereo setups. I also had a pair of Beats Studio Wireless (I know not much to compare to these two but posting for reference) and a pair of Harmon Kardons that I hated.