Deka are some of the finest batteries and are a great choice See if you have a Deka distributer in your area, AutoZone Dura Last Gold or Platinum is also a good choice and have an excellent reputation. The Gold and Platinum are close together but you said that you have some extras on your electrical system so sometimes the Platinum depending on the model of battery can provide more cold crank amps and or a little more reserve power over the Gold but some times they are very close together in their specs. I have used Dura Last Gold batteries in multiple Rams and they have worked well.
If you want conventional flooded wet cell, East Penn (Deka, Duracell). High quality, still made in USA.
If you want AGM, Odyssey or X2, also made in USA. X2 is a newer brand made up of ex-Odyssey people, and is excellent. But also app. 20% more for not that much more performance, IMHO. I go with Odyssey.
Not sure what Costco stocks size wise for the Ram. I got a "Free" battery from the stealership just before the 3/36 ran out and haven't bought one for my 16 yet. But the Costco 3 year non-prorated warranty on Interstates is unbeatable. I have replaced the battery in an 06 Avalon 4 times for the cost of one battery. Every replacement comes with a new 3 yr warranty. Arizona is tough on batteries.