I have the Jamo version of the Klipsch SPL-120, and it's a monster. This is an older model, but still available for about $400. Adding this to my system has been a revelation. I just love it. It's adjustable, so position your sub where it sounds best in your room, and adjust the gain to suit your listening pleasures.
The amp burned out after about 7 years or so. Bought a new one and got it back working easily, though. Reading about similar failures, and the recommendation is to simply turn the unit off when not using. I left mine in "standby" at all times, which apparently, is not ideal.
Some bash Klipsch, but I feel they make some amazing stuff. Good bang for the buck.