A GOOD red-dot with a magnifier.
I'm partial to the Aimpoints. I had a M68CCO, back when they were the Comp ML3 I believe. It had all the NV settings, as well as factory flip-ups.
I had it mounted with an A.R.M.S QD mount with Co-Witness Spacer. Held under MOA every time you took it off and re-mounted. Just put it on the right marked number rail and you were G2G.
I like my Dubstep to go Wop Wop Wop Wop