Yes, you are correct that you DO NOT need the MRC delete; the z71 is passive suspension.
If price is not a major issue, I would suggest Fox all the way. But seriously, that Bilstein kit is not a bad option either.
But the Fox 2.0 Adj IFP coilovers are terrific IMO. I'm on my second pair of Fox front coilovers. Initially had what you would install (Fox part#985-02-018) and now using the 4-6" adj. 2.0s.
The Fox coilovers could be adjusted down when they arrive. Then you could control the front ride height and keep the rake you want. A +1" up front I think would be pretty good. The Fox 2.0s tend to like to lift our front ends up more than advertised. The Fox 2.0s come with a new Eibach spring, powder coated silver w/Fox branding.
If you take a look at the magdelete website (link in post#4) you will see that the company is building new front coilover assemblies using a "stock" front coil. Actually, just looked again and they have added a new Bilstein kit to their lineup. 4 choices in total. Again, you don't need the MRC delete kit with your z71.
There's nothing that says your rear shocks must match the front. You could go with the Fox 2.0 coilovers up front and then do the Rancho RSXL9000 adj rear shocks...that might actually not be too bad a setup. The rear shocks are fairly "cheap" and could easily be replaced. You're z71 has a trim specific rear coil, so you're already realizing a bit of rear ride height increase over the other trim models. Some TYForum members have installed z71 (Tahoe or Suburban) rear coil springs to increase their rear ride heights.
Keep us posted with what direction you go.
Safe Travels!