I generally just collect everything I find, I have a nice set up for one of my houses, I have a safe that holds treasure (Gold ingots, gems, dragon claws, silver ingots, candlesticks) a safe for rings, one for necklaces, another for circlets. A chest for magical things like daedric artifacts, robes, staves, dragon priest masks etc. A chest for enchanted armor aswell as ebony, glass, daedric. A chest for enchanted wepons aswell as ebony, glass and daedric.
I also have a safe for building materials, a safe for common ingots, a safe for more expensive ingots, a safe for ore and a safe for things you get off creatures, like leather, leather strips, tusks, dragon bones/scales, fur and hides. I have chests for potions and a chest for soul gems. Satchel for ingredients.
Probably around several million septims worth of stuff.