1500rms

whats going on guys, i need a little advise on amps. a month or so ago i finally blew one of my old 12's after years of abuse. i decided to replace them with the kicker 12 inch cvx's(4ohm). problem is the kickers are literally sucking the life outta my old amps, so iv been lookin to up grade them as well. i really like the kicker zx series but its kinda expensive. my question is. i can buy 2 zx750.1 cheaper than a zx1500.1. would this be the way to go? isnt it the same power? witch would cause a larger draw on my charging system? i dont have much experence with mono block amps. arnt u only suppose to use one speaker on one mono block? someone told me to get the 1500.1 and wire it to both speakers. is this just a matter of having to sets of wires going to the one output of the amp? apprecate the help in advance. sorry for the spelling