Ultrasone pro 750 V.S Grado RS-1 V.S Senheisser hd 650 V.S stax omega II headphone Which one is better for recording classical SACD music? I need 3D and accurate sound. The technical spec. of the above headphone are quite similar. I found on the web, the ultrasone headphone apply s-logic technology,What is the advantage of this technology compare with stax and grado headphone. Someone said Grado is good for rock & pop, Senheisser is too gentle Any comment of the above headphone?