Are you still looking for Brivo information?
Have you looked into I-ACS?
A single door solution would cost under $900 for all equipment needed, using a UL listed controller and HID readers. Even comes with prox cards.
It also integrates with video out of the box, no additional licensing. EVen though the monthly fees are higher than Brivo, it would cost less to use I-ACS than anything else over the course of a few years. And if you want video integration, it's less right away.
Web based, doesn't need an app, or Java and works with every device.
Just thought I'd mention it