The plan now is to buy a MadCatz until I can get something special like those Saturn pads. I have a pair of Street Fighter II pads for Xbox, but haven't had a chance to test them out on some good 2D games yet. If they work well enough for street fighting, I'll probably pick up a pair for PS2.
Back when nodtveidt first suggested MadCatz pads, I still couldn't find anything with a single D-Pad locally. I guess it was because stores hadn't restocked since X-Mas, because I've now found them in a few places around here.