I can send you a HEV70, and really (almost) don't care if you send it back, as it (allegedly) has an issue, but I could not be bothered to verify that (it sold, and was sent back).
The first thing that any he60 owner should do is lop off the POS Senn connector, and terminate Stax. Take your lopped off connector and make an adapter, like this:
And, I'd definitely get the o rings, replace them yourself, or, have someone like Alex @ apuresound do it (he has owned 4 sets, and worked on another half dozen), and can do the termination. In fact, I could use a set of o-rings myself, though mine were replaced when I bougt them 3 years ago.