Nice Tacoma! Great to see another 4x4 with the 2TRFE on here... I feel as though they are the last in the lineage of "true" Toyota Pickups. CPS (Cheap Prick Special) - no power anything except for steering.
With regards to the battery choice - I've been running a Group 31 AGM (Deka) that I picked up in Anchorage in 2012. It's been great to me, and has endured some hard usage with winching, etc. In my opinion - the dual battery setups just add un-needed weight to our trucks. Sure, they're great if you want to be able to charge your arsenal of iWhatevers, otherwise you should be just fine with a good quality AGM or traditional battery.
Do you have any plans of regearing? Locker, etc?
Here's mine: