There are known issues with that board (http://www.cnczone.com/forums/steppe...per_motor.html
). While inexpensive, I suspect you may run into issues for 24/7 use.
If you decide to go for a different board, and you don't want to solder up one, I don't mind building another hobbycnc board (takes about 4 hours and a steady, steady hand). That is what I am using. Personally though, for a router, I would get a Gecko 540 and call it a day: http://www.cncrouterparts.com/gecko-...rive-p-40.html