I personally would rate Metz at the top, they could be worth a look too. Very good flashes. I almost brought the top one but got a 52 af-1 instead. Touch screen, works like a charm as optical slave from the 7D and better than the canon 430. Big bit cheaper than a 600rt or the metz 58 af-1. Touch screen too. I'd look at those before other third party flashes.
How's the touchscreen of the 52? I own the 50 and would like to add the 52 because it can be used as a master (50 is slave only)
+1 for Metz.
If you need more synch possibilities, a Phottix Mitros might be an alternative.
Again, it all boils down to how you want to use the flash:
on/off camera, radio/light-of-sight/cable synch, ttl?
Zero complaints of the touchscreen on the 52, the flash is a gem.