I have 6 boxes on my network, 4 unix running vps's some are running regular daemons such as FTP, SSH, Httpd, vnc, domain, imap/pop, smtp, etc.. Pretty wide range of ports from 21 - 400's so I don't think you will have any issues. Like Big said keep the ports high as to not alert knologys scanners. I've picked them up with snort just monitoring the network.