Hi Lana and welcome
Now 6 mos post CK..... I'm doing great. Occassional side affects that have really minimized over the past months (ie: facial numbess, hearing, etc). I know it's overwhelming to try to figure out what is best for you, but either way, GK and CK are both very viable options in the treatment of AN's. GK has a fantastic track (historical) record, having been around for over 35 years. CK is, yes, newer and I think of it as the grandbaby to GK. You know that GK is a single dose vs. CK which is fractionated. GK uses a metal head frame (temporary discomfort when you think of the long term affects of the radiation)... CK is frameless and uses a mesh mask (if you click below on my frappr link, you will see me in CK treatment, as well as what the mask looks like). Recent reports show that CK is slightly more "accurate" than GK, but to compare them both, they are pretty fairly even. There are many here that have had CK... many that have had GK. If you get the chance, I would probably suggest emailing some of the folks to start communications to get a feel for their treatments and outcomes.
I can only wish you the best in this very overwhelming time... my inbox is also open to you if you'd like. Just know that we are all in the same family and are going to help you get through this.