It's your money to spend on your knife, so do what makes you happiest in the long run. Farmer is a solid choice, and the newer Farmer X is even better.
In terms of oiling and sharpening, I have used my SAK for many years and its steel is really stainless and probably one of the most rustproof knife I have ever used(save dive knife such as Spyderco H1 Salt). So as long you are not using it by the sea or salty environment, I think a simple wipe clean after use is sufficient to keep it in good working order. If you are using it by sea/salty environment, then cleaning and reoiling probably is a good idea. Otherwise, I will only clean the chassis/oiling the joint once in a long time(every couple of months or even up to a year).
Sharpening is a different story, Vic steel does not have really high edge retention, so you may have to strop or sharpen it often if you use it enough of times. Unless you are breaking countless cardboard box nonstop as a job, you probably don't have to sharpen it until you need to. I usually just strop the blade whenever it could no longer shave, and I could usually strop it right back to shaving sharpness within a minute.