I would suggest picking up Sunset's book
Container Gardening and having a look. You might consider planting in plastic pots that can be set inside the terra cotta so that if you want to move them, it will be easier to do without the fear of breaking/damaging your nicer pots.
You might look at Home Depot or Lowe's for lower prices.
Roger's Gardens near Fashion Island is beautiful and may give you some ideas for planting schemes. They also have a large selection of pots, although the prices will likely be higher there.