You might consider phoning Audio-Video Logic in Des Moines - they were super helpful and friendly when I called about a possible Dunlavy purchase. I'm not associated with them in any way - they were just a really helpful dealer.
That said, Dunlavy certainly promotes the Cantata as a cheaper to make version of the Aletha. I think they're about $1000 difference in price. Personally, the look of the Aletha is phenomenal, IMO, and I don't personally much care for the look of the Cantata. Also, the Aletha has been magnificently reviewed in at least two places I've seen, which is always good for long-term resale. I don't have personal experience with either, but from what I know (and the stated preferences above), I'd go for the Alethas. If the looks and possible resale value aren't worth the price difference, my guess would be that the Cantata's are within a whisper, if not identical, in performance to the Alethas. -Kirk