Whatever
@Quick_Shifter says is going to be the best recommendation 100%.
I have been running 5100's at 2.8 on my truck for close to 40,000 miles now. I put them on with less than 5k on the truck. I have the "warlock" package on mine which raises the truck about an inch from the factory. With the Bils on at 2.8 I sat almost exactly level with the stock warlock springs. This combo rode very well in all daily driving scenario's and mild off-roading. I have since upgraded the rear coils and shocks as my bed load has changed. Currently running Superlift SL-140 2" lift rear coils (these are confirmed by superlift to be the same coils in their 4" kit.) Paired with Icon 2.0 Rear shocks. This setup: 5100's at 2.8, SL-140 Coils, and Icon rear Shocks, Rides like a dream in most conditions. I am looking to upgrade hopefully soon, but only because I like pushing my truck to the limit off-road...
Personal recommendation would be Bilstein 5100 at 2.8, rear .75 spacer, and new rear shocks. The factory RAM rear shocks are trash even when new.
I ran bora 1.25" spacers for a while till my new wheels came in (35x12.5 tires rubbed my Zone UCA) and did not have to trim any stud to fit thanks to the recess. - I would recommend bora for wheel spacers. They are the best.