Mission,
If you do a little research, it appears that Avalon considers the Indra to be a "little" Isis. Apparently the Indra was so good that it forced an update to the Eidolon (The Time). Anecdotal evidence in several reviews and posts online suggests that the Indra made the Eidolon seem a little dated sounding. The Indra has the new Isis crossover design as well as other Isis features and by all accounts is more holographic than the Eidolon (my opinion as well.)
I could have purchased the Eidolons (used), but I simply thought the Indris were better all around.
