Subwoofer Amp configuration help

So im preparing to buy my first audio setup for my car. Im taking out the mach 460 all together and replacing everything.

Heres what im trying to do I need to know if i can do this and if it would sound good.

I want 4 subs...2 in custom trunk box
2 where the rear deck speakers were.
Im planning on using 2 seperate 2 channel amps or 1 4 channel amp. based on my calculations it should work but i don't really know

2 Sony Xplod XS-L12S shallow mount
Sony Xplod XS-L12S Shallow-mount 12" 4-ohm subwoofer at Crutchfield.com

they have a mounting depth of 3-1/8th so it should fit

and

2 Infinity Reference 1252W for the trunk
Infinity Reference 1252w 12" subwoofer with dual 4-ohm voice coils at Crutchfield.com

-the sony xplods have a slightly higher rms so if you have any other amp ideas please share.

My ideas for amps are
(1)
1 4 channle Infinity Kappa Four
Infinity Kappa Four 4-channel amplifier — 125 watts RMS x 4 at Crutchfield.com
according to crutchfield i should have a 2 ohm load if they are all on a sperate channel. Unless its 8 ohm because i have to multiply. I have no idea. So i think each one would get either 125-150 which is about half of top rms

or

(2)
2 Clarion dpx2251 2 channel amps
Clarion DPX2251 2-channel car amplifier — 180 watts x 2 at Crutchfield.com
It says at 2 ohms they would each get 300 which is signifigantly more power but i think my math is wrong somewhere.

Please help i want to get this project underway ASAP :happyhapp

Thanks
-Crazy

P.S.

The rest of the speakers and HU are for a different discussion for now im only worried about my subs. Also if you think that is way too much overkill just say so. It probably is but i really like the subs on the reardeck and subs in the trunk it all looks cool so i wanted both but i don't want to be that guy that drowns out everyone elses music.