Storyteller is great! I think it's often more powerful than Stables. Storyteller works decently as a Copper-sifter, but the real value comes from paying better treasures to Storyteller. Storyteller has great synergy with treasure gainers: the Page line and Amulet stand out here. Treasure Trove is good, but it competes at the same price point as Storyteller. With several Storytellers and some bigger treasures, it's pretty easy to draw your deck without trashing Coppers. The issue becomes reliability. If you've got a lot of treasures in your deck, you want to start with a Storyteller in hand to kick off. So, Storyteller really likes Save, Gear, Haven, Courtyard, and the like.
Storyteller has a complicated relationship with Peddler-style cards. It can be powerful to turn Peddlers into Labs, but sometimes your draw order doesn't work out and you have non-optimal payload.