I admit my initial thought looking at Nova was "this is free with Django!", but I'm pretty sure Nova does a lot more. :) (Django's automatic admin interface still had a distinct "state of the art for 2006" vibe the last time I looked, although to be fair it's been a few years.)

for $199, you'd think Nova would be mobile friendly. Maybe this has changed? When we tried it last year, we were quite shocked it had no responsive design support.