I've had several different set-ups when it comes to subs (if that's the speakers you are referring to).
It's all gonna depend on which series, what size, the amount of power you'll be using, and the desired sound.
My 3 10" JLAudio 10w0's are very rich and smooth, but can barely handle the power I'm throwing at them. You could always go with a better sub series from JL. I think the w0's are very low end.
For raw chest pounding bass, you could try Rockford Fosgate's Punch series woofers. I ran two Punch 12's with a measly Punch 40 amp and it hit HARD but wasn't as smooth.
Then again, all of my knowledge is at least 3 years old, as I've traded that hobby for others. The stuff has probably changed for the better dramatically since then.
Just go to a good stereo shop and listen to some stuff yourself. Remember, it will usually sound even better in your car.