Unless you're on a semi, I think that the integrated forend is really the only way to go. For reliability, that leaves you with Surefire. If you're dead set on a light, and I mean really all about it, just save for a used Surefire. You'll spend twice as much on other options trying to get what you want [unsucessfully] and then end up buying a Surefire anyway.
I have and enjoy the profile of the older Laser Products (pre-Surefire) forends, but older Surefires can be found here for decent prices. Not like we use and abuse them much.