Help me pick batteries

[deadbroke]

Last thing to complete my build are batteries and i was hoping for some help.  I have 3 alternators 1 is 270 and the others are 300.  I have one pc2150 battery as of now.  Current setup i have a rf 1000ad for mids and p400 for tweeters with the 2150 battery and 270 alt.  I want to incorporate my t4000bd into the system add the 2 300 amp alternators but not quite sure which or how many batteries to use.  My original idea was to add 2 more 2150 batteries, odyssey battery, but after looking at their website i was thinking about getting the pc1800 battery, also an odyssey battery.  As a backup battery or batteries what would you guys suggest based on my electrical