The zx1000.1 definetely wont put out "worse sound". From my relatively shorter experience, mono amps put out pretty much the same sound. When you spend extra cash on a good amp though, your basically buying reliability.
The reliability that it wont break, its putting actual wattage (and with kicker, always + some).
The PDX's tho, are really hawt looking. Everytime i see them they really are shockingly small for the wattage they put out.
But out of those original 3, JL would be my last buy. Simply because the other amps listed are cheaper and do the same wattage. Don't get me wrong JL is nice, but the others are somewhat cheaper, and if ur in college like me, u want the goods at a low price.
The SX650.1 is a solid choice, and because I'm a kicker *****, and the DSP, and the extra wattage, and knowing you got an amp that isnt going to break ne time soon, is reason enough. I