dcx will do only 3 way, unless you run sub off the deck, right?
well, most people on here and diyma,eca as well as other forums will probably agree that 701 is best bang for the buck to get the 4way setup running, aside from deck solutions like drz, pioneer p and that's about it?
i think some guys managed to score 701 combo for around 600-700 these days? that's yummu

.
not even talkin about f1, cuz it's way too expensive.
or, carPC and a bunch of money in software...