best PC gamepad under $30?

What's the best PC gamepad I can get for under $30 that's recognized by ZSNES, FwNES, ePSXe, etc?  Comfort and compatibility with most of the best emulators being what I'm looking for, basically.  Any brands I should avoid?

Playing with the keyboard is for the birds.

Logitech makes some. http://www.logitech.com/index.cfm/products/productlist/US/EN,crid=2216&categoryid=429
A friend told me to get one too after I got some games.