My guess is that the following would be one of the easier versions to install. ...hadn't really looked into that, because I download everything via CVS and make it from source. Have a look, and see what you think. Generally, the BSD systems are ranking as more secure than Linux in surveys (kernels not as susceptible to buffer overruns from other packages, maybe?).
http://www.freebsd.org/
Security is a better (cleaner code) in some of the other versions (OpenBSD, NetBSD,...), IMO, but the time to learn would be rather higher for many.
I downloaded and installed FireFox last night, not bad so far. Seems like a very nice browser. I think I will get the mail client next.
thanks for the info.