I ordered a
Atari 7800/2600-compatible gamepad from Retrogameboyz
It's a NES-style pad, placement of the control elements is near perfect and the D-pad is smooth but firm enough at the same time to give a good feedback. Love the concave buttons. It's built very sturdily, comes with a long cable of almost 10 ft. Highly recommended if you're looking for a decent pad for the Ataris or the C64, probably works on a bunch of other consoles/micro computers as well. I chose the rainbow edition to fit to my Euro/PAL 7800, there's also a woodgrain finish version available if you like that sorta stuff.
It also comes with two extra buttons (like select and pause on the NES), there are mods that let you pause a game from the pad instead of having to push pause on the machine. I prolly won't add that mod to my machine coz I'm sitting right in front of it and have easy access to the pause button but I can see how this may be a prob for some setups so it's nice to have.