Actually, the only thing I'm missing is the latest Cowering GBA 2.01 set. I only have the 0.999.7 set. That, and a few of the really large CHD MAME games. I can get those fairly easily, I've just been taking my sweet time. So for the most part I don't need anything else.
You should keep a running list of what you're missing. I'm sure some people would be able to help.
Actually, the only thing I'm missing is the latest Cowering GBA 2.01 set. I only have the 0.999.7 set. That, and a few of the really large CHD MAME games. I can get those fairly easily, I've just been taking my sweet time. So for the most part I don't need anything else.