Sexy shrimp
The 'best' is a matter of opinion. You might want to check out liveaquaria.com's section on shrimp to look into them and what you like best.
The only thing I would challenge is the statement that peppermint shrimp eat coral, which isn't correct. These guys are cleaner shrimp and eat detrius and decaying matter...so unless it's dead they aren't very interested.