Which DAC would fit me best?

I would appreciate any help that I can get, as I've been reading reviews of DACs for the past week and have no idea what to get.
-My budget is $400, I'd like to spend less, but let me know
-My headphones are BD DT880 '03
-My amp is a Little Dot MKIII
-I'm using my MacBookPro as my source
As far as music choices go, I like to listen to some modern Rock, Jazz, Classical; so a pretty fair range.

I know it all boils down to just jumping an picking one, but I'd love to see if anyone had any specific recommendations based upon my setup.