Ordered a ReadyNAS NV+ so that will cover the RAID5 requirements

Home security software

This was mentioned on one of the Linux podcasts I listen to.

http://www.zoneminder.com/

NAS Requirements

Wireless Access Point
Firewall
Print Server
Web management
Bakcup server (use software along the lines of backuppc or backula)
www server
Nagios or Mon (anything with web frontend)
edna
samba
email aggregation - bring gmail, hotmail and isp mail into single account
freenx
ipod sync (yampod etc)
home automation
weather station
home security (webcam)

Products to consider
Ebox (Linux distro)
FreeNAs (FreeBSD)
'Linux'
Freecom FSC3