If you want to go for gamepads, there are not many options.
You can get 

 in PD77, which I would consider too hard (okay, you can certainly beat it, but reaching Tuber means more progress^^), 

 in PD51 (which could be the next one, but it's not an easy PD either) and 

 in PD64 - which you can get too. That PD is maybe the easiest of those three, but the slidy ground is of course quite hard to handle.
The other gamepads are impossible to get for you - 

 requires the Nightmare Key, 

 the Pungent Key (so you would have to beat PD97 first), 

 the Wine Key 

 and the N64 pad is in Hell 
