Casio is good. I borrowed it from a classmate and it worked very well. I recommend it...
It is a professional model with no entertainment built-in, just a dictionary.
But it is more expensive. More than 2,000, but very useful
It has a large vocabulary, clear and detailed explanations, and New Oriental helps you remember words...
I am a sophomore in high school, and I bought one myself. It's not Casio's 1000-color screen, it has N multi-functions,
It has everything you need in ancient Chinese and English dictionaries, and it's very easy to use. Paper dictionaries are better, and there is no need to buy too expensive ones. Casio ones are good but too expensive for me. If it is just to facilitate my studies, the following one is also good.