#3 without any hoops looks good to me, but I also like #4 & #5 with the small hoop in the centre. It would be great if you could buy #4 and only bolt the centre bar in when/if you needed it. That way I could go without hoops, but add the centre one in later if I decided to add some off-road lights or wanted a place to mount an antenna.
#1 & #2 look pretty good to, but I think I'd need to see them on an actual car before I could be certain. The details of how they integrate with the front end visually would be important to me. #5 & #6 look very stout and tough, but don't really seem right to me on the WK2.
Hope the feedback helps. Your designs are looking pretty sweet!