Requirements: Cheap, Eazy parts to find, Fun to drive, NOT a Miata, Very reliable.
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I only know of 3 types but I guess it also depends on where you live on whether the price is cheap. In Australia these models I am recommending are reasonably priced and parts are on the cheaper end. Datsun Bluebirds (1979-1986), Ford Escorts pre 1996 and Toyota Corollas pre 2009.