The Gizmondo!
No really, im used to the PS1/PS2 controllers, they are ergomonically pleasing, and all of the buttons are reachable without repositioning my hand on the controller.
The few times i have used an X-Box/Gamecube controller, they have seemed too fat. And the gamecube has an annoying yellow toggle button if i remember correctly, although Gamecube users seem to love this. I guess its what you are used to.