Good advice already posted ^^,,,,,, I'll add,,, despite your limited budget,, just $100 more will get you into a much better sounding sub like the RSL- Speedwoofer. If thats not an option then as mentioned check out the budget sub thread.
-Funk 21.0LX Master/Slave combo 4800 watts RMS/9600watts (peak)-
-Chane A-2.4 L/C/R
-Chane A-1.4 side/rear surrounds.