HI Jacques Welcome to the forum. CNC4you do some very good 3.1Nm motors and are a good buy but you are limiting yourself with the drives AM882 or EM806 are much better and can be run them at a higher voltage 68V would be about OK. If you are mainly cutting MDF etc then 10mm screws for X and Y and 5mm on the Z.

Think about the router as the Chinese 1.5kw or 2.2kw water cooled with VFD are a much better bet.

Don't be temped to buy a kit of electronics as they are never matched as you will know if you have been reading the forum for the past 4 years.

Start a build log so all the questions etc will be in one place.. Good luck with the build