I envy you greatly right now, you're about to embark on a beautiful journey. Xcom2 is one of my favorites, especially once mods factor in, of which there are thousands covering so many franchises and ideas you can't possibly play them all.
I wish you nothing but an excellent time and lots of dead aliens.
Xenonauts 2 is 30% off also. It's a modern version of classic X-COM, which is quite different from modern XCOM. It's still in early access, but it's very good. I've done one playthrough (to the end of what was available) and I'm waiting for release to do another. It's much better than what XCOM has become in my opinion though.