Are there any good wireless bluetooth earphones out there that block out outside noise?

Im looking for some to go with my ipod touch. I've got Sennheiser-CX-300 earphones currently. These are the best earphones I've ever had. They are good at isolating outside noise as well, though if I'm around people who like shouting then that gets through

Anyway I thought it was time to upgrade and wondered if anyone had any suggestions?