Why do you want separate headsets? If you're already happy with the Clarity Aloft and don't need a change, you should stick with it.

The E170/175 is not nearly as loud as the E145s were, but down low it is still quite noisy. Over about FL300 it starts to quiet down quite a bit. I have used the Telex 5x5 with RJ package in the both the 175 and the 145. All day comfort and hearing protection, just like what you use now.