Hi,
I've worked with nagios for many years now, the largest nagios implementation I ever setup and managed was over 500 hosts.
I have over 10 years experience as a system admin in a Linux, Windows and *BSD environment.
I'm based in San Francisco and regularly consult for startups in the area. Please let me know if you have any questions.
Kind Regards,
Mark
P.S. Veni, vidi, vici,