So far I'm enjoying my Aikun Morphus X300. It's been powerful enough to run almost everything I've thrown at it so far and I like the bigger screen and the removable controllers. The negatives seem to be that even though it's fairly new, Aikun seems to have already abandoned it. There aren't any software updates available, no one has rooted it, and the promised accessories have yet to appear. That being said, the glasses free 3d screen makes watching movies a treat.
(For emulation I basically just added the emulators I needed.)