I have the Quiet Technologies "Halo" headsets. They work well on my unit. Lightspeed headsets should work good as well.
The unit doesn't like miss matched headsets, at least mine doesn't and it's a PITA to open up and adjust if it's installed in an inaccessible place. The instructions should have a section on making that adjustment. Try your new headsets before you try adjusting the intercom.
I like it because you don't have to make a sound to "break" squelch to begin talking and once it's set up, it's pretty much transparent in operation.