How would you have gotten the wrong ones if you enjoy them?
Don't be put off because people here find Beats and Bose to be bad values--if they work for you, that's all that matters. Of course the issue is to find what works for you. Are you dissatisfied with your Senns? If not, why upgrade? And really, don't upgrade unless you do an A-B test and the candidate headphones blow you away and blow your Senns away. If the Beats didn't do that, then maybe they're not for you.
Someone did have a good suggestion to go to an Apple store to try some headphones. Take your Senns and iPod with you, and try different cans with music you really like and know well. Oh, and doesn't Apple carry the Audio Technica ES7? Fun.