Well it has been a looooooong time and many chases over the years, but I finally got a Gyrfalcon(#620)! I wasn't planning on going today due to weather and work(so did not have scope or regular camera)... but got done a bit early. I got some super crappy digi-bin pics of it looking away from me, as it did pretty much the whole 1/2 hour I spent viewing it from my car as the sleet/freezing rain fell in Cape May county, NJ. A few head turns by the bird and the sheer size made ID easy(There is a pic from the original finder floating around showing the size difference with a Peregrine... just amazing. So no postable pic yet, as I won't amuse you with my pics from today... but if it sticks around, I will be going back this weekend when weather is better and will update here if I get a good shot.
EDIT to add: This is NOT MY PIC... it is the one I was mentioning from the original finder Dustin Welch showing the size difference. The bird on top is a Peregrine...