I've run the stratus bibs this season in Ky, with mid weight merino long johns I was ok down to 40ish if it was calm. If the wind is blowing I run a gortex layer of some sort that'll actually block the wind or I'll freeze.
I run mid weight merino, a grinder hoody, stratus bibs until wind picks up. Once that happens the Hudson bibs and delta jacket go on and I'm comfy to mid 30's.
Once it gets that cool I'll throw on grinder pants over the stratus under the Hudson bibs, I've fished/duck hunted while blowing sideways spitting snow rods froze before I got cold.
Of all the Sitka I own the grinder hoody/pant set and Hudson bibs/delta jacket are the only pieces I really need. Those bibs and jacket are louder material but will truly stop the wind and are absolutely waterproof.
The stratus bibs aren't any warmer/wind proof than my old cabelas wind proof fleece set unless you are super skinny buy a size larger in stratus bibs, I've never needed anything more than large except in them.
The Dakota hoody is a **** fine piece of kit too, it's quiet and actually windproof, it's a good compromise between windproof and quiet
I'd buy the fanatic bibs, and just put them on once you get to your stand.