I have my main with AB/Banshee and the rest is weekly caches, survival caches and UG caches.
Second - full of random DPS orientated gear - no space left at all.
Third - full of performance mods, gear mods, weapon mods - all different god roll varients that may suit different builds. + SP, + health + armour etc
Fourth - named weapons and weapons with nice talents( my most treasured alt lol) - few spaces left for tommy fun and midas
Once 1.6 drops, they will become empty quick as I figure out what to build and delete the rest