What kind of car amp..should I buy? Do I have a good combo?

I'm afraid you have bitten off more than you can chew.

Those subs handle 5000 watts RMS each. To push them to their fullest potential you will need 10,000 watts RMS.

Lets do some math.....

To figure curerent draw, you take power times the efficiency of the amp divided by volts divided by 2.5 (the average power in a test tone). Let's say 80% efficiency.

I = ((10,000 / 0.8) / 14.4) / 2.5

I = (12,500 / 13.8) / 2.5

I = 906 / 2.5

I = 362 amperes

Now this 362 amperes is just to run the audio system, you need to add on another 20% to power the vehicle as well (lights, heater, etc.) so...

I = 300 x 1.2

I = 434 amperes total

What this all boils down to is you will need:

(3, Three) Group 31 deep cycle batteries

(2, Two) 200-250 amp alternators

Upgrade the "Big 3" - that is to replace (or add to) the power wire between the battery and alternator, the ground from the battery to the chassis and the ground strap from the engine/tranny to the chassis with at least 1/0 AWG wire.

Got money?