I have been using BosEconomy without problems, showcase plugin seems to be supported (BosEconomy supported plugins list).
yes, i have not ran into any problems while using economy plugins i was going to use bosEconomy but it doesnt tell you what each node does so i didnt use it although if someone tells me which node does what i might be willing to switch EDIT by Moderator: merged posts, please use the edit button instead of double posting.
I use Essentias which has lots of usefull commands and also has its own economy system integrated (Essentials Economy)
Essentials? This plugin have built-in IConomy system... http://dev.bukkit.org/server-mods/essentials/