any higher output alternators for 2000 corolla's?

i have a 2000 corolla. i am in the process of installing a stereo system into it. i had my mechanic test my alternator to see what it puts out and it came out to run at 90 amps which he said is pretty good for a 4cylinder engine. problem is that if i get the system i want i will probably be burning up my alternator all the time. does anyone know if there are any high performance sites or manufacturers out there who make an alternator for the 2000 corolla that puts out more than 90amps.

If it makes any difference with the system i want to put into my car.
The system will consist of:
1-KICKER KX600.4 4 Channel Car Amplifier 75X4 at 4ohm AMP
1-LICKER KX800.2 400 watts x 2 at 2 ohms AMP
2 SETS OF INFINITY Kappa 60.5cs 6-½" Component Speakers
2-KICKER S10L7 4-ohm Solo-Baric L7 Dual Voice Coil IN DUAL SEALED BOX
1-5 FARAD CAPACITOR FOR KICKER KX800.2
1-1 FARAD CAPACITOR FOR KCIKER KX600.4