Greetings!

Perhaps a good (and easy) middle ground is the Hanaho HotRod joystick. Not the full arcadePC, just the controls. It plugs in line with your standard keyboard. It really has a great feel to it for most games. Unfortunately, tempest is my favorite, and they do not have a spinner / trackball variation, so I use it in combination with my regular trackball. For $200 it gives you a great arcade feel on your standard PC. For what its worth...
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs