Windows 7 - Looking for network & Internet monitoring software

I'm looking for some software that can monitor inbound and outbound traffic through my D-Link DIR-655 router by individual workstation.

I'm running a XP machine as a server x86, with coldfusion MX (for our home website), and a syslog server on the same machine. The software would run on this machine.

The criteria are;

1. I should differentiate between intranet and internet traffic
2. It should be persistent; that is; it keeps track of stats between reboots of server (software like active wall does not retain stats when server reboots).
3. It should also be able to run when server is in logged out state, either as an application or service, preferrably a service.
4. It should not cost alot.
5. It should be able to collect stats on all connected workstations, whether DHCP or static IPs, including consoles like PS3, Wii and xBOX360.
6. It should support XP, Vista and 7, in both 32 and 64 bit versions.
7. Preferably, no agent should be installed on each of the workstations (flexible on this as long as footprint is small). All workstations are 64 bit.

This is a home network, with 17 connected devices; windows 7 x64 x 9, Win XP x86 x 1, PS3, Wii, xBox, and 4 iPhones.

Please forgive if this should have been posted in software or other forum. I thought this one fitted because it's related to networking.

thanks
Tanya

we're using work examiner internet monitoring software to get a lot of information on web traffic usage. scheduled reports are sent to admins and managers every monday, in pdf and xls. Great tool..