The best option for a 596 or 598 is the SDI mod plus the following:
[Linked Image from blackmagic-design.com]
Not cheap though - approx �340 from Scan: http://www.scan.co.uk/Product.aspx?WebProductID=866057&source=froogle


Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.