FWIW, I have the same saw, and have found the cut quality on the supplied blade is actually pretty decent. I have not bothered replacing it with anything else as yet...
You might want a finer pitch if doing lots of cross cuts in real wood, but for ply or MDF it is less of an issue.
(I did buy a multimaterial blade for it, so I could cut steel as well, but for timber the stock blade is pretty good)