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Part 3 is a classic, as it was the first one I played (I always dream about the background of the Castle and Inferno, and the Conflux), and part 5 has a great storyline and 3D graphics.
In general, if they just added a bit more detailed and complete graphics to part 3 (so that there wouldn't be problems on wide monitors, for example, with stretched or blurry units/pixels) and added 3D to that specific graphic style, it would be amazing!