See I could actually go the way of just run no real coop I think - a guy down the road has the most lovely looking / safe set up with high safe fences and in the middle of the huge paddock (which OK he is an old French dude and obviously not read up on here!!) so sadly has no trees or anything...
I think if it 'had' to be done for whatever reason in a backyard setting a Woods coop would be the way to go, plenty of fresh air and sunshine getting in.