OP,
Congrats on your first 1911 and one hell of a way to start. I have both a Wilson CQB and Tactical Elite. Both are functional works of art. The options are endless as far as what you can order or have done to your gun, but as all have stated before me, your options are limited unless you SSE. I have a CQB Light rail on order with a number of upgrades that I hope will come in before the year. I will have to SSE it and it will be a pain in the ass to do so but worth it to me. I also have the barrel needed for the SSE, if you need it shoot me a PM.
You can always send the CQB back to Wilson to have the work done with your options you want if you were to buy one off the shelf (CA compliant). As far as the flat wire kit, I put one in my CQB and like it. It does make a different sound when racking it and the felt recoil is no different than the regular wire kit, but it does feel smoother. All 3 of the WC have battle night sights by Wilson, yellow rear and green front. All have the Bullet Proof 1 piece speed chute. FCS, take them or leave them. Some say its easier to press check, some don't like how they look, that part is up to you.
Lastly take a look at the 1911 forum. Wilson Combat has a rep that is very active in the Wilson Combat section of manufacturers. There is a wealth of knowledge there much like here. When it's all said and done, and the wait is over, you will be VERY happy with your first 1911. Congrats and you will end up buying another Wilson, it just happens.
Stay safe
Tack