There is nothing wrong with the dovo best line. I have one in 6/8's that is among my very best shavers.
Key is to make sure you get it honed by a reputable honemeister so that it is truly shave ready and learn proper stropping and skin stretching. I am not familiar with the site you have posted, but I know straightrazordesign.com, vintagebladesllc.com and classicshaving.com are all places I have received truly shave ready blades from. Of course you can always use the classifieds to pick up a nice blade, but remember if you ruin a new dovo there are thousands to take its place. If you ruin a vintage beauty its gone for ever lol