I'm going to delay my decision until after the holiday season.
I think this is like the third thread you've started where you have talked about selling your Sig and maybe your HK to fund something else. You keep coming back to the Shadow 2. There's nothing wrong with being a CZ exclusive shooter if they do everything right for you. But remember that you very recently bought that HK and seemed very enthused about it. I can't remember if you had the same reaction on your Sig, but I seem to remember you did.
So ask yourself, if you are already considering selling guns you seemed to really like very recently, is it really the guns you like or is it bringing home new toys, and then the glamor wears off? I'm not saying it is that, just that your pattern may indicate it, and asking yourself the question may be a good idea. Sometimes it takes a few attempts to figure out what works for you. I have found when I am looking for a particular gun, I really enjoy the pursuit almost as much as actually bringing the gun home. Then once I shoot it, my enthusiasm either grows, or I consider selling it. That's usually around round count 1000 for me. If I'm not enthused, it goes in the trade category. You may really enjoy buying and selling guns, and that's fine if it isn't hurting you financially.
I recently thought about trading away several guns I owned in the idea of limiting my numbers and focusing on guns I really want for one reason or another. However, another forum member suggested I stop and think about each individual gun, and the reason I had originally purchased each of them. It was good advice, as I realized I the reasons I had bought them were still valid and I'd regret trading them away. Do I need 20 different polymer striker fired 9mm's? Nope, but I like having one. Maybe take a minute and consider redundancy in your lineup, and it'll help you decide.
As far as making a decision after the holidays...………….. you've already made the decision. You want a Shadow 2. You're getting a Shadow 2.
The only question is how.
To be honest, I like mine enough I've been thinking about trading my VP9 towards a second one meant for nightstand duty. I would kind of want night sights on it.