Ive got all of those hosts, but I wouldnt presume to tell you which host is best for you.
If you like shooting 1911's, get one of those. If youre a Sig guy, go that route. Glock fans should buy Glocks. Im a CZ fanboy, so I enjoy shooting them the most. A host isnt worth a damn if it isnt a pistol you would normally enjoy shooting without a can. I always prefer a larger host for suppressed pistol shooting, as it balances better and allows you to shoot more naturally. Extra weight hanging off the pistol will cause you to apply pressure to the grip differently than how you normally would.
Also, scratch the Walther off your list. The PPQ Navy is an awesome gun, but jams up alot while suppressed. You have to swap the striker spring and possibly the recoil spring just to get it to function with a suppressor mounted.