Many have suggested to me the Audio Technica A900s. Despite their closed design, I find them much more enjoyable (soundwise) than the Sennheiser HD650s with no amp. With amp, I'm not sure which one would top out. Any ideas anyone? Personally, I find the A900s very hard to beat. Size is large, however. But comfort is extraordinary for both. The extra isolation from the closed design is just as valuable to me. Who can tell me an unbiased opinion of the A900 vs. the Senns with amp. I have not bought either, but my friends have them. Remember, UNBIASED is key. And I know that I haven't included the Grados
