When it comes to wiring....


WIRE IS WIRE. None of it is any better than the rest. The gauge is the only thing that matters. That price is ridiculously high. I'd build you a ported box for 150$ even, including supplies. Install is cake and if you're decent at any sort of wiring I would attempt it yourself.

Edit, what Alpine sub are you running? Type R? Type X? I'd run the R IMHO.