Right now I am using dictionary.com free app, just because it's free. I want something that work similar to the dictionary for Mac, which I believe is based on the Oxford American Dictionary and Thesaurus. There are a lot of dictionary based on Oxford and I don't know which one to pick, not to add that they are expensive in most cases. Any recommendation? I have used the Audio Concise version on my friend's iphone, pretty decent but I still see a lot room for improvement, and it's $30.