I'll also say a 4-switch woody/vader. The Heavy Sixers will go for a lot of money usually, but you can always get a reasonable price on any of the 4-switch models. Like Retrogamer said, the junior would probably be the most affordable, but definitely was made cheaper. I should know; I've owned all variants of the 2600.
Also you can get a 7800 for backwards compatibillity and you can play both 7800 and 2600 games.
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