FWIW, the Soekris 4801 is a "better" board than the WRAP. It has support for
usb, while the wrap needs to be modified in the power supply section to do
it (loosing the switching power supply).
For firewalling only, they're the same, but the 4801 is more "general
purpose" and with the hard disk you can run a general purpose mini-server
rather than just a firewall. You could attach an external ADSL modem on the
USB (or perhaps an extra ethernet or wireless adapter, or why not.... a usb
memory dongle or even an external cd-r or dvd-r for backup purposes). And
while I'm at it, a usb hub + several of these devices :)
Still... if you consider that the production price of the 4801 is under
$100... the $200+selling price seems a bit steep.