Outstanding generousity -- hats off to you!

Your post seems to imply that you'll be running the web server and your connection on the same box, and from expirience I can tell you that's an invitation to trouble. Even if there's only angelic monks there's still the rest of the web to consider.

You might want to consider getting a separate low end pentium 32MBRam 500MB HDD and OpenBSD for a connection/firewall box. (Don't slap me it's just a more security slanted version of BSD).

You may also want to peek at tzo for $100/year they handle dynamic DNS forwarding so you can manage your own DNS servers from a dynamic IP as well as services for managing mail while your systems offline.