Call Rich at Coral Ranch. He has some long tentacle anemones that are reasonably priced. I got one about a month ago that when it expands is about the size of a dinner plate. Plus the guys there are really great at helping you out.
As for favorite, I really like RBTA. They have great color, real hardy, and easy to take care of.
Just remember, all anemones like to wander around at first until they find a spot that they feel comfortable with. If you have any power heads in your tank, make sure you cover the intake side just in case your Anemone gets to close. I lost one that way.