Chris,
I bought one of the HNT Gordon blades. I believe there is still one there. They wanted about $90 each for them, so I left the second for now, at least until I make sure I need another. The length is perfect for the planes I made, a little under 4". Maybe you can see in the picture that 1/2 inch less was a little too short.
I have not used the HNT yet but will soon. Until I have a wedge made to fit that blade I would not be giving it a fair go.
http://www.flickr.com/photos/1689105...ream/lightbox/