I recently upgraded from JC1 monos to a CH Precision M1.1. The differences are shocking, as they should be for the price difference. :)
I suspect your system will improve greatly with the right amp.
Do high dollar mono blocks truly improve the Sound Quality over the mid tier amps
I'm currently running a pair of Classe Delta Mono"s to drive my Wilson Alexx V's. IMO they sound wonderful with plenty of power. I've been considering upgrading these amps to the next price/quality level. My biggest concern is whether I'll get the level of improvement in SQ that will move the needle. I'd love to hear from folks who have made this move in their systems or heard comparisons at shows or dealers.