I agree about the HD Sights, and I'd also love to see the Trijidot Shotgun sights as well, as they are a really unique product. The Bright & Tough series is often overlooked, but I actually think they offer good value for money, particularly when used to upgrade a firearm that did not come with either a decent 3 dot setup or night illumination.
Though the ACOG is cool, I rarely see it on rifles at the range or in the field anymore, as HWS and traditional reflex and red dot sights have become 'de rigeur' again. With the high cost, wide array of styles and reticles, I'd personal say that from a business perspective it might be smarter to keep it S/O only.
The RMR and particularly the SRS are extremely unique, and probably on a few peoples wish lists, though I'd probably avoid any of their variable power scopes. The prices are outrageous and having shot several VCOGs and TARs, my experience with them is that there are dozens of other options that offer better features and far better value. That said, I am a fan of the Accupoint 2.5-10x56. The glass is sharp, and the post reticle is very nice. The only downside is criminally short eye relief that varies from 4.1" to 2.8" at the high end. Ouch.
Cheers