Do not under power Type R subs. They need alot of power.
I suggest the Rockford P1000 mono amp ($600 at Best Buy).
You will NEED at least a 1 farad CAP (bigger is better) to keep from pulling too much power off of your charging system. This will also allow the amp to function properly and sound its best.
I also highly recommend that you have a certified installer wire the subs/box for you, dual coils require making sure they are wired properly to keep from frying something, I've seen problems many times by amateurs doing their wiring.
Ask the installer his opinion on the box. What type and size of box you install the subs in is CRITICAL to how they will sound. Some sales people know what they are talking about, but the installation technician is your best best.
Lastly, I'm not big on pushing service plans in general but for car amps and subs - GET IT!