Since I'm hyped up for UE4 games, especially because of the freedom to edit quality and graphical settings ingame to suit your needs... (and because I also like emulators)
I present... NewRetroArcade!
http://cubeupload.com/codes/7fc1cc (Images, because Imgur compresses the pictures)
(Don't mind the framerate located up top, I had it at highest settings, and at 200% my resolution for best quality)
http://digitalcybercherries.com/And there ya go, if you want to try it yourself.
Even has an editor to change cartridges, or arcade systems to games you want. (and their art, too)
Just thought I'd post this if you haven't seen it already :D