just, no.

a good reputable brand sub cost between 300-400+ at least for an entry level not including enclosure box/installation/wiring
a good reputable brand amp cost starting around 1k +/-

just under 4k. proper ICE is waaaaaay more expensive than a full headphone setup.

case in point, i only spent 1.5k+ for a mid range audio technica headphone + amp (you could probably argue i didn't buy a DAC, but seriously, a standard sound card + ASIO software DAC is muuuuuch better than anything under a centrance level DAC and that cost 1k+)

while i spent yeah, 4k for an entry level ICE setup.
to scale it up, refer home theater/home hi-fi, much more expensive than ICE

man, you've been asking literally the same question multiple of times, and i believe you are indeed getting the same answer. if you think you know your stuff, by all means just do as you like. it is your money after all.

decent car amps cost between rm1k to 2k for an entry level 4channel(again, reputable brands, not chicken brands) assuming you would want it to drive your subwoofer too

im using boston acoustic GT40 4channel, bought it for around rm1.5k back then IINM

they are no longer in production and are replaced by newer models:
http://www.bostonacoustics.com/Amplifiers-C252.aspx (take a pick lol)

then there are also other brands like helix, JL audio, german maestro, rockford (they do pack a punch in the SPL world heh!), dominations and so on so forth (can visit the brand thread too for more info/idea or even recommendations: http://forum.lowyat.net/topic/832695 )