One of the original retroclones, Swords and Wizardry is a great choice for both new-comers as well as those who want something different. It has what I think is the best cover ever created. Simple choices in classes and races, and the single savings throw is nice. I don't get including both ascending and descending armor class; the multiple savings throws were tossed out, so why not just stick to ascending? While some will like all of the asides for alternative ways to play combat, etc. I think they start to get a bit distracting. I just like a game/rulesystem to present one "set way" and then let me house-rule if needed. The Core edition is a nice balance between the spartan Whitebox and the text-dense Complete.
[4 of 5 Stars!]