I'd say go for Konamix for PSone, that was my personal favorite ver.
I have 4 Red Octane pads (not ignition ones, though) and they all work amazingly well. If you think you're going to be really into it, any pad by Red Octane is good, and the Konami brand pads hold up pretty well. If you're just testing the waters, you can get 2 cheap pads from ebay usually for $20 or less, and they last for a while (i had some which broke after about 4 months of 2-hour-a-day, 7-days-a-week play)