My personal list (**Custom battles won't work**, and I have no idea how to order these mods so I've had 1 or 2 crashes in a 350 day campaign so far)
-Better exception window
-McM w/ dependency mods
-Native mods
-Army formations made easy (requires modlib. ALSO currently a bug w/ McM where "mod options" won't load and you can't adjust them but they are still there and function properly. Author is aware and fixing w/ next patch)
-Adonnays troop change
-Diplomacy fix
-True relations
-Improved Garrisons
-RTS camera
-Realistic Battle w/ realistic armor
-Improved combat AI
-True noble opinion
-True prisoners
-True Brigands
-Delayed reinforcements (It's buggy w/ easy army formations, better off choosing either or but not both. That being said, I do it with both. Even on the extremely off chance the AI works it's seriously amazing. )
-BSI troops
-BSI realism patch
-Bear My Banner (Had to use standalone version, McM caused crash for me)