Audio Systems: 2002 altima, ymm, high output

Question
Ive been looking to do a few upgrades and have already done some; ive put in a AQ1200d amp; and 2 10'' kicker l7s; with a new kenwood headunit. The problem im running into is voltage drops; i knew this would happen. I know i need a new battery; my question is; what specs should i be looking at; im eventually going to upgrade the system again and was wondering where i can get a "bolt on" high output alternator
thanks for any help

Answer
You will want to be looking at the current capacity (amperage). Be sure the alternator can handle the existing vehicle and the additional audio gear demands at the same time.

Here is a link to one place to get these:
http://www.streetsideauto.com/category.asp?ParentID=35&SubID=95&
ptid=3340&brand=BFTC&LookupType=YMM&gclid=CInVlbyOrZsCFQ6jagode0AHCA

jm