So, I've largely finished the mechanical part of my little CNC gantry router/mill (see build log here: http://www.mycncuk.com/threads/12593-Game-on!), and am starting to get together parts for the control box. All the stuff with PSU, stepper drivers is pretty obvious, but I'd welcome opinions on what I should have in the way of front panel controls (switches): some builds I've looked at have basically just an E-stop switch and that's it, others have quite a lot of controls. So far I can see I deffo need the following:

Mains on/off (NVR switch)
E-stop
Limit over-ride (so you can jog back off the end stop)

Things that look like they might be useful are:

Spindle On/Off??
Water pump On/Off?? (interlocked with spindle)
Coolant On/Off??

Cheers,
Trevor