I use a microsoft sidewinder gamepad
They have nearly the same setup as a PSX controller except for:
1. No L2 or R2. (it does have L1 and R1)
2. It doesn't have those 2 analog thingys.
3. No select button. (I usually just use the extra macro button for select)
It even has 3 bottom buttons (A, B, C,) and 3 top buttons (x,y,z) so you can program L2 and R2 into the 2 extra buttons. I have never used the analog thingys so I wouldn't know what they are for and dont really see the need....
The digital control pad is very similar to the PSX controllers pad. Its even in the same comfortable thumb-easy-to-reach place.
Oh yeah and it has a macro button for use with some software so you can create macros.
It also has a start button.
I usually just use the macro button for select since it doesn't have that.
Oh yeah and i don't have the USB version in the pic but the one i have is exactly the same.
Here is a pic:
EDIT: OK almost the same, the start button (the upper of the 2 buttons on the bottom in the middle) is located farther up. There is also an "M" on the macro button and "start" next to start....lol ok mbe a little obessive