A wet cutter will cut the trav better than a grinder but will get the stone soaking wet, this is a problem as you will not be able to get a decent bond to the back of the
tile if it is wet. If you get your hands on a decent grinder disk it would save you the hassle of drying the stone before laying it. I dont use Bal (at least I haven't for a long time), I use Mapei adhesives and grouts and usually lay
cement boards with Keraquick. When it comes down to grout, there are a few to choose from but if you go with Mapei, they do a grout called Ultracolor Plus. This does just about everything, really is all singing all dancing but Im afraid you will have to pick the colour you want, there are 26 to choose from :smilewinkgrin:.
As I dont use Bal I will let somebody who does tell you which products to use on that front.