[Orb] Listening to CD's in 5.1 surround sound

Hi Guys, i setup my first real 5.1 system yesterday and ive had a great time on the living room floor listening to cds through the new system, some just sound amazing while others well, sound a little odd, highlights were the orb, of course, but orbital, underworld, anyone here had any experiences with simular systems, any recommendations for cds /dvds to look out for next time im doing a shop online?? Hope you all had a great christmas, best wishes for the new year in advance, Steve