The Delta series is very nice, plus they have a crap-load of connectors on them. As far as other recommendations, you can look at RME or Terratec for alternatives, but the RMEs are much more expensive (but better sounding), and the Terratec's are a little more commercial than M-Audio. You call. What's your budget?
That's your call, however simpler cards are usually geared towards gaming and recreational use, and therefore are more lenient when it comes to EMI (my sworn enemy). I'd say stick with the M-Audio setup, and you won't be disappointed.