You should use strong encryption.
I tend not to send out my SSID name, this adds another layer of protection. To log into your network, they need the name. I'm sure there are ways around this but it may help.
I would not use the default name from the router. Once you connect, it will look for the network and it already has the name, so connecting is not a problem. Occasionally it is with a new computer.
The laptops can then be secured in place when you have a permanent place and continue to be used, or be your flexible option.
I very much prefer hard wiring, but in this case, wireless makes a lot more sense. Speed wise, N is faster than 100 but not as fast as gigabit. Again, more than adequate unless you have a lot of concrete walls or metal in the building.
