Billing Server

[Matt Juszczak]

Hi all,

We're setting up a billing server on a Xeon 3.06 ghz with IDE drives (but 
it doesn't need to be amazingly fast).

The billing system we're using supports freebsd 4.11 natively with 5.x 
support.

I need this machine to be tight, and although it will have a public IP, pf 
will be installed to keep SSH access to our network only as well as the 
web interface of the billing system.

I'm wondering whether to install 4.11 on this machine or go with 5.4.  I 
need something stable, rock solid, and secure, and I know 5.4 is this 
also, but it is updated more often than 4.11.

What does everyone recommend?

Thanks!

-Matt