which pioneer amps do you have ?? depend of which power the pioneer amps you should use it for powering your 12" and use the 4channel for your 4speaker. since most of the 4ch amps have a RCA out you can plug the sub's amp by there.
The Hifosonics seem a better deal since you will have probably around 50RMS per ch in 4ohm and the kicker about half (that enough for your pioneer but maybe not for the kenwood.
something that i found really interesting for the price is the alpine MRP-F240 (149.99$) with 40RMS X 4ch in 4ohm is a really good choice for the speaker.
