Sena SMH5 for me and the girl. No issues with volume with our earplugs, but maybe our ears are younger than some. i only have to have the volume maxed at highway speeds or good songs
I use a full face. Wired mic.
If you're an audiophile i think the smh10 and newer versions can be made to accept headphones/earbuds, but most of the time music is just kinda background noise for me, something other than wind noise or silence, i don't expect amazing quality.
comms are great. sssooo much better than shouting at each other. highly recommend going this route, especially if you have a passenger. much better experience.
Also great to have navigation via Maps or Osmand navigated routes (although i still screw it up and have to get out the phone sometimes).
one thing to keep in mind is that newer sena's use univeral intercom and can intercom with any other brand, but not all of them can reciprocate. i.e. a sena can broadcast to a scala but the scala must respond via phone call (i'm 90% sure that's accurate last i checked). That only really matters if you will be using it with other riders.
I just picked up a smh10r for some upgraded range and to let my buddy try the smh5 if he tours with me. Also the smh5's were acting a little funky, but it appears they just start disconnecting when battery is low. Additionally one wouldn't pair as a phone, but once cleared the pairing memory from phone/sena and got them all updated on firmware they all work great.