I recommend that you use the RFC1918 class B block. 172.16-32.x.x I've seen networks that use 10/8 or 192.168/16 internally, and if you have something like a laptop that needs to travel between your network and others, things can get hairy when IP addresses conflict.
I've had to renumber my entire network on at least one occasion due to conflicts with my ISP, and it's a pain. -- "Curiousity killed the cat, but for a while I was a suspect" -- Steven Wright Security Guru for Hire http://www.lightconsulting.com/~travis/ -><- GPG fingerprint: 9D3F 395A DAC5 5CCC 9066 151D 0A6B 4098 0C55 1484
