Where can you sell your expensive items on a regular basis in Skyrim, to avoid stockpiling items?

The stores don't have much money (unless you use them to train you in some skills), and thus if you come back after a mission with a couple of expensive items, you can only sell a portion. If you then store the rest, and go on another mission you'd only return with more expensive items and no place to sell them. I use Whiterun to sell my goods, but there must be some other 'large' stores out there with some cash to buy the expensive, enchanted jewelry and magical items?