I just need a two button controller with a D-pad that works and has good response. The Atari CX78 looks promising. And I can see that other members here are warning me not to get one. If I plan to buy and play through Midnight Mutants on the 7800, no one button Joystick controller is going to be of any valuable assistance to me.
Having played a bit of the game on an emulator, I can honestly say its a very enjoyable and fun game that I would like to play and beat on my Atari 7800.