Here is an interesting article on the "Sons of God," also draws a distinction between the Nephilim and Giborem...
I thought it was funny this Jewish fellow actually believes the same way I do about Matthew 22:30... imagine that!

Sons Of God... Sethites Or Fallen Angels?
"The following article is only a portion of a Biblical study on Demonology: The Doctrine of Fallen Angels- Dr. A.G. Fruchtenbaum. Dr. Fruchtenbaum is a Messianic Jewish believer and founder of http://www.ariel.org in San Antonio Texas. He comes from a family line of Levite Priest (father and grandfather) and has knowledge of scripture that is just uncanny, nonetheless having become a believer in Christ at a young age, his father threw him out of the house for converting from Judaism to Christianity at the age of 17 or 18..."
http://www.evolutionfairytale.com/fo...er&f=23&t=1327