Quote Originally Posted by Gameguy View Post
The Model 3 isn't compatible with all games so you probably won't want that, it's harder to find than the first 2 models anyway. There are also a couple of games that are only compatible with the very first version of the Model 1 but I don't think most people care about them much. Either the first or second model will be fine, if you're really picky with sound or video quality it should be mentioned that there were several different revisions of the Model 1 and Model 2 and some have better video and audio quality than others. It would be a pain to track down specific versions. For the most part I don't really notice much of a difference between them so just buy whatever you can find.
Sound advice here. I might add: A model 2 costs less to ship if the seller isn't a shit. Also, the 3 or 4 games you can only play on a first run model 1 are playable with a Game Genie, and finding a early Genesis can be tricky. Here's more to get you started.

http://www.gametrog.com/GAMETROG/SEG...ion_Specs.html