I love Diamond Audio mids. I also love CDT Audio, which is what I'm using now, the old Clif Designs guys before Clif was junk.
As for the subs, I'd go with 2 12W6s and two JL 500.1 or 1000.1, if JL is your preference.
I ended up getting the alpine pdx1.1000 to power the two sub. How do you think that will work.. I can change it for the JL no problem