FUCKMS: MGD2's are near to impossible to find, and would cost you an arm and a leg. If you just want to do SNES, look around for the SuperUFO. I have one and love it.
It lacks a parallel port, so you have to do the games via floppy disks, and is only 32mbit - so no Tales of Phantasia, but everything else I've tried plays great on it. SuperFX/DSP1 support if you have an original SFX/DSP cart in the slot.. Built in GameGenie/Goldfinger/AR codes.. HiRom/LoRom/FastRom/SloRom, no compatibility errors.. Basically plays everything but Tales of Phantasia (wan't worth 400$ to me for a 64bit machine for the sake of one game). Only thing I wish it had was parallel port to load roms from PC faster.. But I even wrote a little app for myself to fix/split games, format 1.68 floppies, and copy them automagically, so it's all coo...
I got mine at www.superufo.com, but I see them on some other gaming sites as well.
Emulation is fine and good.. But there's nothing like playing the orignal