Hey there! I am a soon to be new 2013 Nismo owner and was wondering if I could chime in!
I come from a pretty decent audio background so here's the first thing that come to mind (i apologize if i didnt read enough into your audio builds).
With those speakers you listed you realistically need without a doubt active processing. I highly suggest AGAINST the JBL MS-8. I would go Audison Bitone, Pioneer DEX-P99RS (my personal favorite), or the Mosconi DSP 6to8 (i hear is pretty good). I have personally used all of these extensively except the new Mosconi one.
Having 8's and 10's (especially the w3) is kind of redundant IMHO. I'd highly suggest getting the biggest sub (cone size) you can fit. Having 8's and 6.5's is kind of redundant also IMHO. There's very little pickup an 8" can have in addition to a 6.5" that a correctly tuned/positioned subwoofer can't. Keep it simple!
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