Otherwise Steve's LED is clearing out of their current stock and their V2 violets are pretty decent if you run them under 500mA and keep them cool (350mA if they will be getting hot like on the same heatsinks as your M's) But you can run a ton of them and parallel wiring would be just fine (three strings on a 1000mA LDD I'd not worry about too much, just do some balancing and install 500mA fuses on each string) That would let you run in the ball park of 3 or so of them off a single additional LDD using a 36v PSU)
Low current is the key in most of the violets available to ensure long life span, at least when you look at the less expensive versions out there. RapidLEDs can run all day long at full power and get just as hot as my other chips with no issue, though but that is the exception to most of what is available right now, (Can't wait for the violet Luxeon Z to get affordable and readily available) So I would also expect the same results from the chips sold by ReefLEDlab (same chips but better bins, I've got no experience with their stuff yet though)
:beer: