Of the brands you listed the K gun would be my choice of the four listed,but not my first choice.

I find the Merkel comes closer to the balance of one of London's Best for me at least.

Have not gotten any experience with the V-C yet. Bill has a some good advice on attending the Dallas Safari Club show. There you can get a idea of what fits you best, feels right and even be measured.

With that said, get what YOU like, make sure it is regulated for your choice of ammo, and go hammer something.