Hey, long-time lurker here who's been excitedly following this project for a while now.

I saw a discussion of best Blu-ray media a few pages ago, and everyone was jumping on Verbatims so I had to make an account and chime in.

Verbs burn beautifully but don't have a good shelf life. The best BD-R media I've used is Panasonic. Some people have reported good results with SmartBlu sold by MediaMegaMall but I haven't had very good luck with those. My burner is a Lite-On iHBS112-04 with PL06 firmware.

Here is a Club Myce thread with some relevant information, including a link to a French degradation study showing that Panasonic and Sony are better for long term storage. Most of the folks over there seem to be of the opinion that Panasonic, Sony, Falcon Pro and SmartBlu are the best BD-R media.
http://club.myce.com/f33/best-bd-r-archival-330175/

The Panasonics can be bought off eBay or Amazon, just search "panasonic bd-r".