There is a lot to choose out there but here's what I am using:
Alpine MRP-M500
RMS Power Ratings
Per channel into 4 Ohms: (@ 14.4V Ƈ%THD+N, 20Hz - 200Hz) 300W x 1
Per channel into 2 Ohms: (@ 14.4V Ƈ%THD+N, 20Hz - 200Hz) 500W x 1
Sound Tuning
Crossover: 50Hz-200Hz, -24dB/oct. (Low-Pass)
EQ (Equalizer): Bass EQ (Fixed Frequency): 50Hz 0 to +12dB
Subsonic Filter: 15Hz (Fixed), -24dB/oct.
Foot Print (WxHxD) in: 10-5/8'' x 2-23/64'' x 9-33/64''
JL Audio CS110LG-TW3
sealed enclosure with one 10" TW3 subwoofer
5/8" medium density fiberboard construction covered with black carpet
steel-mesh grille
2-ohm total impedance
power handling: 100-400 watts RMS
frequency response: 24-200 Hz
sensitivity: 82 dB
21"W x 14-1/4"H x 4-7/8"D (6-1/4" with grille)