If I get it right, you'd like an all-in-one kind of thing, no? Then I would recommend you the SuperCard DSTWO. It has an impeccable DS ROM compatibility, and because it has an extremely powerful processor on board, it is able to play GBA games, and it also has its own SNES emulator, which is much better than the other SNES emulator, SNEmulDS.

(I used to have a Max Media Dock, too!)