Which Groupset?

So... question about the Campagnolo groupsets for a friend who asked me. What's the best bang for the buck between mechanical Centaur/Athena/Chorus (I guess 2013 range, or is there something vastly better in 2014)? Any things to know before buying?

centaur is 10s, athena is 11s (and comes in silver), chorus 11s and can change 5 gears with thumby.

get the best you can afford, campag is awesome, don't listen to hippy.
For best value just get veloce.