Good deal for the console and games. Gunstar Heroes for Genesis is worth around $75 on it's own (if it's complete). Astal is around a $60 game, Clockwork Knight 2 is around $40, and the rest are in the $15-$30 range complete. Saturn consoles generally sell for $60, so you did very good (plus you got two controllers). Definitely get a composite cable (or s-video if you have an older TV that supports it).
Also, you'll need a CR-2032 battery to save games to the system. There's a small battery door on the back of the system. After that, I'd recommend splurging $40 on an Action Replay. It will add extra save storage (the internal Saturn memory is very small), allow you to play import games, and work as a 4mb RAM expansion for games that require it (like some Capcom fighters).