mine (going by retail prices)...
head unit: Pioneer DEH-P8400MP ... $600
subs: dual 15" solo baric L5 ... $750
amp: rockford fosgate 800x4 amp ... $400
custom box + install ... $100
total install ... $70
its about 2 g's. go figure.
how much i paid: subs(donated), box(donated), amp(donated), HU(385 shipped), install(70) = $455 total. + neons = approx $500