For 2K you can get the speakers upgraded. Or just keep the system you have and add a mono block, subs and box. You doing the work yourself or having it done? If having it done, the wiring work alone could be $1,000. I just reworked my system, $1200 in head unit, $800 for subs, $1300 for sub amp, 900 for 4 channel amp, $900 for 6 new speakers, $160 for new tweets, $300 for new street wiring and monster cables. This does not include sound deadening material anywhere. If all you want is big power, just add SPL subs and amp and be done. If you want SQ, spend some time and think about what you really want.