20 Amp Circuit with 15 Amp outlets
Folks, folks... 

15A outlets are totally legal on 20A circuits.  

Because the NEC makes an exception specifically for that (National Electrical Code): 

The exception is by careful plan. It would be stupid for electricians to have to carry two types of receptacles on their truck.  So UL (the listing agency) requires all 15A receptacles to have internal circuit paths good for 20A. This allows the same receptacle to be used in both 15A and 20A circuits.  It also allows two appliances totaling 20A to be plugged in at once, even though each appliance is less than 15A.  The extra copper is trivial, they still manage to sell these things as cheap as 60 cents apiece. 

If you want a quality receptacle, buy one.  You can buy quality NEMA 5-15 (Mr. Horrified) for $3 and up.  You don't need to buy a NEMA 5-20 (Mr. Winky) to get quality, but it assures quality since cheapie 5-20's are not commonly made.