I don't know if any of you have been following the development of the Retron5, but I think it sounds pretty slick. It was announced today that it'll be released Dec. 10 for $100.
http://hyperkin.com/blog/2013/09/hyperkin-to-release-retron-5-on-december-10-2013/Here's another article describing the system, though the final product will probably look pretty different (at least what they showed off at E3 looked quite a bit different).
http://hyperkin.com/blog/2013/03/retron-5-details-revealed-from-the-midwest-gaming-classic/For $100 you have a system that can play NES, Famicom, SNES, Super Famicom, Genesis, Mega Drive, Game Boy, GBC, and GBA. And it'll be compatible with the Sega Power Base allowing SMS games.
And it has save states!
There's a bunch of other audio and visual "enhancements" they also claim (all can be turned on or off individually), but frankly, I don't care for the smooth look they produce. It also has HDMI out.
If only they included Turbografx compatibility, this would have been the ultimate system.