I have a delta 60tooth blade. it does perfectly well for cross cutting veneer plywood. 80 tooth is great too Im sure. I cant justify a $100 blade, blades like those get sent out to be resharpened which saves money in the long run Im sure, but for my use, its easier to just buy a new blade.
what are the dowels for? joining the planks? not really required, a glue joint will hold MORE than fine. but if you want them for assembly alignment, decorative accent, or peace of mind, I cant imagine Id put one more than maybe 1 per foot? maybe less... like 3 on the whole lengths (ends and center) unless its a decorative choice, then thats completely up to you.
glue a butt joint together with some scrap, clamp it, and let it dry. 3 internet points if you can break it apart. glue is strong stuff. the dowels wont be needed for strength.