the XOOPX controller of course!
http://xoopx.pwp.blueyonder.co.uk/controlpanel.html
NEED INPUT! JOHNNY FIVE IS ALIVE!!!!!
HEY LASER LIPS! YOUR MOMMA WAS A SNOWBLOWER!
but seriously, the right controller for the right game.
tomb raider needs a psx controller. its unplayable on a dreamcast.
q-bert needs the diagonally mounted arcade 4 way joystick
pacman needs a proper 4-way
marble madness needs a trackball, etc