As far as build kits go, Shimano Ultegra or Campy Centaur are both excellent mid range groups. For a little less try the Campy Veloce 10 speed. It is not much different from the Centaur and several hundred less. You won't notice the difference once it's on your bike. Try Gary V Hobbs for the kit. He is the only dealer that stocks lower level build kits. Everyone else stops at Chorus & Ultegra. Good Luck
http://www.gvhbikes.com/kits.html
Tim