I have both the Warne Maximas (QD's and "permanent" versions) as well as a couple of sets of Optilocks.
The Warnes are similar in weight (they may be a few grams lighter), but they will cost you about half of what the Optilocks cost, while being absolutely solid. Most of mine set me back $65 to $75 (the QD's are the more expensive of the two).
Western Gun Parts in Edmonton carries the Warne Maximas, and, of course, Brownell's carries them.