Well, since you're on a forum... I'm going to suggest a different approach. Get less parts, but better parts. Those amps are not that good, the subs really aren't either, and the C6's aren't much of a DLS setup. When someone said lower end DLS, I don't think they meant the Classics (maybe...) at least the Magnesiums for 2 bills?
How about a good set of coaxes, a single sub, and a good 4-channel amp? You can do that for $500. Then later you can jettison the coaxes or use them for R fill...
How about an MTX 12" in a box, a Kicker 4-channel amp, and a set of MB Quart Discus coaxes? Last time I checked you could get all that at onlinecarstereo for under $500. Better gear and better sound too.