The Super Retro Console and Adapter by Retro-bit doesn't have the best name, but I like what it could do for my old game collection. It accepts carts from the SNES, NES, Genesis, and through an adapter, GBA, covering most of the 8- and 16-bit era in one little box. It has three cart slots, 6 controller ports for use with original controllers, and comes with two controllers of its own -- all of this for an MSRP of $69.99.
You'll need the $39.99 Super Retro Adapter to play the GBA games, mind you. The adapter comes with a link cable for connecting other Game Boy systems to it.
A bundle of both the system and adapter will be available for about $90.
Innex will be showing off this console during E3 this year. Next-gen consoles? Pssssh.