I wanted it to the point I bought the international version full price and am using it on Straight Talk ($55/month) which uses the AT&T network. I didn't give up my Verizon account.
Regarding AT&T I'm not sure you will be happy. As Kim Komando likes to say, they have "no bars in more places." At my office I'm in a solid AT&T 4G area (not even close to an Edge or 3G location) according to their coverage map, but all I get is Edge speed. It doesn't get any better when I go outside to the parking lot. However I do get 4G at my house where I don't really need it because I use WiFi.
My plan was to use the GN on Straight Talk until Verizon got it and then sell the GN. I really don't know how long I'll keep both accounts, but I will never give up Verizon because their coverage is more dependable.
The GN is a true joy to use. I really love it and in my book, the iPhone 4S is just your average smart phone, but I do use the iPhone 4S for a mobile hot spot at work because of the poor coverage on AT&T.
I think our best chance to get the GN 2 on Verizon is in October. They surely won't bring out the GN 1 while the SIII is in full promotion this summer.