I've come to like coinmarket.io.  They are clean cut, no bloat, and fast.  Sure there downtimes for a couple minutes every now and then, but it's new.

Mintpal looks decent too, but the volume needs to rise to catch up.

Coinedup is so slow, not to mention my noscript complains about multiple things on the page that are questionable.  I've removed them from my tabbed trading pages.