My guess is that the OP's setup is fine, but like someone else said....

Chain tension. Having too tight a chain my experience makes for a loud ride.

Also "new new" parts tend to be much louder.
Wait till the parts find their groove.

If you're really worried about noise;
Take a spin out in the rain.
The drive train just meshes so much nicer when it's wet... like sex.

</3 cents>