Even the helmet-mounted Sena (and similar offerings) have begun dropping the speaker jack for wired earpieces, following the trend of today's phones.
It limits which models I can choose, and while I haven't sprung for one yet, it will be the top feature I must have. I'll likely have to get one of the older models.
I just bought a Schuberth C5. I would spring for the integrated com system that is essentially a Sena 50s, but there is no headphone jack. I'm just going to stick my Sena 50s on the side of the helmet with the adhesive in the kit.