I am thinking of using Monowall as a replacement for our current Watchguard
Firebox.

We have 70 users and host our own own email server.  We use webmail
extensively.

What hardware would people recommend for using Monowall on a network of our
size?

I've been looking at the hardware supplied by Logic Supply.  What type of
network environments have others put monowall to use with?

http://www.logicsupply.com/default.php/cPath/73

Thanks,
Eric