Besides having ocellaris in their natural host, I have had them in LTA's, crispa, and haddoni. Their natural hosts are either the two hardest anemones to keep or one of the most seldom imported.
If I were you, I would go with a BTA. It's not their natural host, but it's much easier to care for. Once a clown fish moves into an anemone, I don't think they care if it's their natural host or not.