I know Krikzz will likely never do so, but I think the Neo Geo is long overdue for some kind of flash-cart. Prices for the actual games are far beyond absurd, and even if the cart was about $1000 USD, it would be a more than justifiable purchase. Also, the NG multicarts have too many problems, let alone those of us who prefer the AES to MVS. I do have a Daedalus converter, and it works well enough, but it's just so...UGLY with that yellow brick sticking out of its side. This is ignoring, of course, how finicky the converter is (I have to jam a Wii Remote between the AES body and the 161-in-1 cart in order for the graphics and sound not to be garbled - it's a bloody heavy cart held vertically, after all).
A Neo Everdrive and a GBA Everdrive are all that I need to make my life complete.