thanks for the replies and suggestions, i guess i'll do one step at a time and see how it goes. here's what i'm planning to do in the order listed:

1) new battery 880cca gel battery - DONE
2) re-do battery relocation with a better battery box and run 1 gauge wire
3) big 3 upgrade
4) tsunami 5 farad capacitor with 18/24 volt surge (overkill since my max rms is going to be less than 800w)
5) if all else fails iraggi h.o. alternator

somewhere in there i may try to do an autometer voltmeter, but depends if i can get a good deal on one. thanks again for all the suggestions.