Roger, HD-SDI is for obsessed videophiles (like me) who demand and will pay for that last 2 or 3% PQ increase

if I were you I would go for a VP50pro scaler if I wanted HD-SDI, you gain so much for all your sources and they can be add at amazing prices these days

you can certainly add HD-SDI

if you are crazy about video HD-SDI is worth it, but it is costly

the Oppo will also do standard 480i/576i SDI output when a DVD is played

thanks

-Gary Murrell
http://www.custom-ht.com/oppopowerbuy.html
My Personal HT setup