O.K. so before Ive even finished Ive got another design change and have added 2 more subs, for a total of 4 10" 8ohm kicker c10's. They're rated @ 150wrms and I was originally going to use the zx550.3 to power the components and have 420+ watts available for the subs. Should I stick with this amp or go for the zx750.1 to power the subs and hide a small 2 or 4 channel for my components?

Let me know what you guys think.

 

What components are you using? The 550.3 may not be sufficient at 4ohm stereo to run a decent set of comps. Plus the sub channel isn't overly strong for what you're going to be using it for.
I would suggest going with a different approach. A ZX750.1 would be a great power match for your subs.

 

go with the ZX750.1 more power to the subs...