Looking for an amp....Opinions about Odyssey or Bel Canto audio anyone?

Regarding the ground loop hum, their Candella preamp does have a slight ground loop hum.  My friend has extremely high efficient speakers (we are talking 99db efficient) and you can definitely hear the ground loop hum interaction between Candella and Khartago.  However, it's not that bad.  If you use a normal 87-89db speaker, you should not hear it.
--
Regarding the Parasound amps.  They are very excellent high current amps, but are voiced on the warm side.  If you want a warmer and fuller sounding amp (especially if you have fast/thin sounding speakers such as Focal), then the Parasound will likely be a much better choice than the Odyssey.

Odyssey is a rather "underdog" type of company and they do not do all the "measurements and specs" that major companies do.  I have looked at the Odessey equipment and overall architecture.  It is very good and uses high quality internal components, but they do not have all the bells and whistles that major brands do (such as remote turn-on trigger, etc.).  Not even a magnetic power switch - it is a fully manual rocker switch.  If you want the most amount of sound quality in a piece for the least amount of money, then Odyssey is definitely a great option.  I have a friend that has the Odyssey Khartago/Candella combo and it does sound very excellent.  If you get the amp, I would recommend doing the upgrade to get the bigger power supply capacitor bank.