Best battery for my 99 Tahoe

[bigal11419]

I am currently running a PowerMaster 200 amp alternator and will be doing the Big 3 upgrade next. The truck has a dual battery setup without an isolator. Since I have no idea on the age of the currently installed batteries and to be honest they look like crap; I want to get some new ones.

What is brand and model battery is everyone running and how do you like it?

For anyone running dual batteries; do you run an isolator and why?

 

[Jaymike44]

I'm currently running 2 duralast golds with the big 3 and 200amp alt and my voltage rarely drops below 14 and when it does im probably demoing my system but it only drops to 13.6

 

[bigal11419]

Wound up going with the Duralast Golds, already have the 200 amp alternator so next will be the big 3