If I had to go buy a desktop again, at this point I don't think that it would be worth it for me. I don't really game, so all of the horsepower is just sitting idle most of the time. My Surface Pro 3 would be plenty for 99% of what I do with my computer. A bigger screen, a dedicated mechanical keyboard and a comfortable mouse make all of the difference in the experience for me personally, and using those as peripherals for my Surface would make for just as nice of an experience, I think. It really depends on what you need the computer for, but if I recall correctly you have a pretty nicely specced laptop which should be sufficient unless you plan on doing some serious gaming.
It really all depends on personal preference, but I think I would want a mechanical keyboard and a separate screen if I were in your position and had the money to spare.