I'm setting up an office with a wireless network. The number of users will be in the 25 range at first, but could grow to 50-75 in the future, all wireless. What's the best wireless firewall product to handle this many users? I've researched the SonicWALL TZ 170 SP and I've used sonicwall in the past for wired networks, but I've never had to setup a network that's only going to be wireless. Any suggestions and/or recommendations would be greatly appreciated.