The Wii mini (aka the red and black one) is missing a lot of features from the regular Wii. For example, Gamecube and Gamecube controller support has been removed (so that would remove the "best" control method for Super Smash Bros. Brawl). Additionally, internet was removed so if you wanted to play Mario Kart Wii online...you could not (let alone any other online game). I believe they also removed SD card support so if you ran out of storage room you would potentially have to erase other game save files. All in all, the Wii mini is something to be avoided at all costs.
I would agree with Ashman and spring for the Wii U. I was able to buy one off a friend for a very good price and it has been the console I have played the most on. All of the Mario games for the system are really good so far (I've been addicted to the new Mario Kart - buy the DLC).
As for controller support...get ready!
- Nintendo GameCube controller (with Nintendo GameCube adapter for Wii U and only works with Super Smash Brothers for Wii U)
- Wii Remote Plus
- Wii Remote with Wii Motion Plus adapter
- Wii Remote with Wii Motion Plus built in
- Nunchuck controllers
- Wii U Pro Controller
- Wii Classic Pro Controller (I am pretty sure)
- Wii Classic Controller (I am pretty sure)
- Wii Fit U Fit Meter (For Wii Fit U)
- Wii Balance Board (For Wii Fit U)
- Wii Wheel (though it is just a piece of plastic)
- Nintendo 3DS (as a controller with Super Smash Bros. for Wii U)
- Wii Zapper (though it is just a piece of plastic)
- Wii U Microphone (I have no idea what this is used for!)
- Probably a good chunk of Wii 3rd party controllers
- Wii U Tablet like controller (Comes with the system)
- Probably some other stuff
You may want to check out this
site for Wii U information.