Given your list of CDPs the short answer is no, the IMOD is not better. It is exceptional bang for the buck but having heard some of your CDPs and owning an IMOD I wouldn't give the nod to the MOD. Again, saying that, it truly bats well out of its league in terms of money out layed VS sonic return . It is excellent for a second or third system, not to mention its raison d'etre, as a portable device. I use my IMOD with a Ray Samuels SR-71 amp, wire is top of the line ALO, headphones are the Grado 325I and Audio Technica ATH W-1000. Software has oscillated between Rockbox/Flac and Itunes/ALAC. I've done a lot of A/Bing and to my ears the Rockbox/Flac combo is slightly superior, YMMV.
Hope this helps.
Regards,
J.