Honestly...
That sub and box is WAAAAAAAAAAAAAAAAY overpriced. Don't get me wrong, the w7 is a great sub. Did very well on the Klippel and I've had them in my car before. Loved them, but I paid less than half that for a pair of them (albeit used, but if it's taken care of properly then it doesn't really matter).
I would HIGHLY suggest you looking into relegating your funds in a different manor. According to your break down you're looking at spending roughly $2,500. In my opinion, and take this however you'd like but I'm just being honest and trying to help, that's a pretty horrible lineup of gear for that amount of money. Besides the sub, which I'll get to, everything is bad to mediocre AT BEST. Again, I'm not trying to be mean or call you an idiot or whatever....just trying to help because if I think you might be happier with another route with which you get a lot better quality then I'm going to tell you.
Speakers: Why rears? What's your goal....to get as loud as possible or have sound coming from all directions or what? Have you heard a properly set up car with JUST a front stage setup (or rears that are run through DSP)? Not only can you add the rear speaker costs to the front to get a lot better speaker, you can cut installing time/cost and most people will agree that it sounds much more 'correct' to put it vaguely. Obviously it's up to you, but it will be PLENTY loud. You don't need a lot to get extremely loud in a car...a few watts will usually get you to a normal/fairly loud range.
Sub: I assume you like your music run hot through the bass right? Maybe you listen to electronic, rap, etc with a lot of content down there, but I'd suggest looking elsewhere or if you're really wanting the JL w7 for some reason...then the used market. If you just want to be heard....you can get much louder for cheaper. If you're looking for sound quality...you can do it better with another combo including DSP on the sub vs. no DSP. Huge need for this in car environment. You're putting 44% of your budget into something that covers 0.003% of the audible spectrum (20-20kHz...even lower if you want to do 0-20kHz or higher).
Amp(s): With your budget and not knowing your goals it's hard to say here...but you 'could' be better off with a single 5-6-7 channel...depending on your goals/wants/needs.
* I though I would add that I have a distribution block that can run multiple amps just sitting in my garage. I actually have another that's a 1in-2out (2awg or 4awg I can't remember) that I don't need either. The big one is this (
). Shoot me a PM if you want it
Amp Kit: Looks way too pricey, but I usually buy blocks and wiring separate so not sure there
Wire/RCA: Monoprice....good job! lol. Good stuff there. Used both of those. 12awg is overkill for your speakers so if you want to get 14awg and get 100' that'd be better. Definitely don't want to run out. More wire is always helpful
Deadening: Highly suggest putting more of your budget towards this also. Install is one of the most important factors. I can shed more light on this, what you'll need, etc if you'd like.
* For $2,500 you should be able to do a nice 2-way front and single/dual sub setup with 1 or multiple amps and DSP. There's a reason why most run DSP..
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