Personally I don't like option number two. That open tube is an eye sore, a place for dirt to collect, and ultimately a failure point.
I would rather see you use one of the other options.
But this would possibly be the best option.
It will be smoother and quieter since there will be bushings at the frame, and you still have adjustment of your camber. I would just make sure your caster is correct, or that you can adjust it via the lower arm as intended to do stock.
You could also use a slotted upper mount like this to adjust camber and caster, like is used on most Chevys now.
As long as your bushing and inner sleeve are the correct length, it will stay in place when tightened.