As others have said, all of these will work and all have pluses and minuses. If I had to pick, I would probably pick 2. Giving the rad fans the ability to put more positive air pressure on the rad is a good thing.
Another thing to consider - having fans 'compete' for the same air creates unwanted vortexes. Your rear exhaust fans and top fans will definitely be competing in any of these scenarios. If the intake is strong enough to at least give a little air movement to your VRs, without an exhaust, I wouldn't use an exhaust.
All of this depends on the specs of your fans and how unobstructed the case grills/openings are, of course.
Edit - Is your PSU at the bottom left with one intake and one exhaust fan?