I use 42 inch crates and they are plenty big for the 80-85 lb males. A 48 inch crate is harder to place around the home, but certainly would give them more room. I think mine actually like the walls touching them, as 2 or 3 will pile up in one crate when the door is open and they pick the smaller ones over the large.
Each of my boys have 42" crates. The crates are large enough for them (70, 80 & 85 lbs). I bought crate wheels at Petsmart so that I can roll the crates out of the way and vacuum underneath them. I use bath mats with the rubber backing (they aren't chewers) for their blankies.
I only use 36" wire crates - plenty big for the boys, but they usually sleep in their kennel runs unless someone prefers a crate. The girls sleep in 36" wires too, but inside there are 36" and 30" plastic crates and the girls are always wanting to sleep in the smallest crate possible (doors are left open all the time and the smallest crate always has a line to get into it).