Reddit reviews Saitek P990 Dual Analog Game Pad

The GameTech wiki has some great recommendations on controllers. You can use the original Sega Genesis controllers with USB adapters, which is what most people would recommend. I personally use a Saitek 6-button controller.

Don't think it will fit your needs, but I really liked the Saitek p990. 4 shoulder buttons, 6 facepad.
http://www.amazon.com/Saitek-P990-Dual-Analog-Game/dp/B000AL703E

Works great for N64, can set up to use almost any retro system out there. Unfortunately, quality wasn't that great and for some reason companies don't like making 6 facebuttons (like N64 A+B+Yellow Directional or Sega 6 button gamepads), that also feature shoulder buttons and additional front buttons for Start and Select.

It's a shame, I'd pay good money for a decent controller with this setup.

Also unfortunate that they don't make this kind anymore.

Ah ha, I've considered an alternative controller like that too. That's actually a really nice find, I may have to look more into that one!

I ended up buying one of these and hating it:

https://www.amazon.com/Saitek-P990-Dual-Analog-Game/dp/B000AL703E/ref=sr_1_1?ie=UTF8&qid=1483262319&sr=8-1&keywords=saitek+6+button+analog

It's not ergonomic at all and my hands start to hurt badly within even an hour of using it. The analog sticks have corners and it's difficult to find exact "up", down, left and right on them. They're not bad sticks (I can win 1st place on Master F Zero X with one) but, like I say, after an hour I'm sore as heck and I certainly feel FAR more precision on a PS3 controller than this Saitek. Also, the D-pad on the Saitek is absolutely awful. I don't like playing 2d platformers on it at all. Not a good catch-all emulation controller, sadly.

I'll have to look into your link though, that's interesting.