Why not take 500$ of that budget and go to a big SQ event/competition somewhere and get a look/listen to see what people are doing. It's really a small investment given your budget to really see what works and what does not and get some ideas of what sort of equipment can be made to sound good.
Also if I were throwing that kind of dough at a SQ install I would NOT be without the Pioneer dex-p99rs for head unit. it is an incredibly powerful tool to give you all the processing you'll ever want.
There's dozens of good quality components and IMO proper location, deadening treatment, and testing and tuning with some good processing will get you what you want with brand being a secondary concern. I'm not a huge JL fan, but their stuff is solid (if overpriced) and you might as well get their multichannel amp to match cosmetically with the one you already have.