That depends on what you intend to keep, whether you wish to use a chiller etc.
Personally for a 2ft, with low bioload, I would use Eden 501, since it is fairly silent once up and running. Only thing is, it has to be on the same level as the tank, not lower than the tank itself.
Eheim 2211/2213/2222 are good too, if you don't mind spending more.
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