We have a very simple stash (mainly because I don't know anything else and we basically just started), but it works well for us. I don't have enough money to buy the expensive brands or play around with getting a ton and seeing if they work or not. So we make these work.
15 OS Alvas with 10 extra mf/bamboo inserts
I just got 2 more off of a b/s/t group but they won't be here until next week.