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Depending on the mileage, you could probably get a decent 2000 Box S in your price range. Maintenance, etc., will be more, but will have the power of the 350Z.
My '01 was "in the mid $20s", bought from dealership with a two year/100k mile warranty. They're out there. Even w/o the warranty, if you buy well, Boxsters aren't going to drain you like some people think they will.