Hi I agree with "Flakez" go with JBL from components speakers to JBL amplifiers..but if it is difficult to find JBL's go with your Infinity's as they are the same manufactures (Harman Kardon).

This my set-up JBLGTO Coaxial 6.5 speakers and JBLCS 10" speakers..

Powered by JBLGTO 75.4 amp and My sub powered by JBLGTO1201.1
Most important as well is your HU I would 100% recommend Clarion! if not go with Apline (Min of 4volts RCA line output) your system would be easier if your HU has a SUB out..with Subwoofers find someone that can help you design a BOX and KNOWS how to tune the box..Dont let anyone just build you a box and dont know how it sounds.. Hope this helps..good luck!

This is a slot Port(breather) tuned to 34 hz. this box is from my brothers car. It is musical and hits low freq.

And lastly, patawad po sa pics hindi pa po tapos to nang kinunan ko to..this is my KICKER COMP VX 15" box tuned to 34hz as well..