Looks interesting. A little pricey for my needs right now, but I understand the programmatic access to things is useful at the very least. If/when I switch or have a programmatic need, I'll look at this more closely.

I don't see any discounts for bulk domains (I've got ~150 I manage).

Also, I use virtualmin - having a plugin for virtualmin to allow registrations and management through nameterrific might be useful for you to look at (although you've probably already got 1000 ideas on your plate).