Thanks for the advice, for the router it's not so much the Z travel itself that needs to be long but the Z clearance, basically I need to able to machine at most about 75 mm deep (hence travel of 150 at least for tool clearance) but on parts that can be 100mm to 450mm thick (where the top gets machined) but I do not need to be able to do both at the same time, so a solution might be to have an adjustable table height or simply a high gantry style router and use table risers for the low parts to bring them up to the Z axis..
Definitely still a work in progress...

I'll probably start with the grinder though, kind of more urgent for me

Anyways I'm going to start on the grinder first because that's the one that is more urgent to my needs