What is the best knife sharpening system for me?

So I have been looking to buy a new knife and a knife sharpening system. The knife is a Smith & Wesson M&P code: SWMP3BS. Also I have been looking at knife sharpening systems from Lansky and Gatco. I am trying to decide what kit I should get. Is diamond worth the extra money? Also I need atleast one serrated hone. I know if I buy either system I will also be buying an ultra fine hone to get that razor edge. I am not just buying the kit for that one knife but also to use to sharpen my family and friends knives aswell. Which company do you think offers a kit with the most "bang for my buck"? If you know any websites where I could get the specified system for the lowest please post.