Comment on CheckBook Pro

I quite like this one. It's quite simple, and has all the features I need, and was pretty cheap for me (part of a package purchase). The reports are fairly flexible as well, though I'd recommend testing them yourself before buying, in case they don't suit your needs. And it imports from my bank's format, which saves a ton of time.
There's also a "lite" version for $10 less, which I've also used. Aside from the multiple-item-editing, I haven't used the pro features much, but the smart folders are similar to other apps.