I can tell you right now that the Sennheisers will blow the 700s out of the water! I know, I have them both. Even my senn px200s sound much better. I bought the senn 580s to replace the 700s because i was sick of getting headaches after 20 minutes of use. Buy the senns, you will realize how much you were loosing with the 700s.

BTW - The 700s are great for djs, I use them all the time for mixing because all i need to hear is the high hats or drums. People should realize that is exactly what these phones are made for, dont buy them for casual listening. THEY ARE DJ HEADPHONES!