OK heres the setup:

2 DNS Servers - Win
2 web hosting servers - Win
1 mail server - Win with Imail
1 SQL server - Win SQL 2K
1 FTP Server - Win WSFTP
1 Spam Filter - Linx

Reguadless of OS what would be the best, or what is the best firewall to use. I don't really want to have to learn hungarian-voodoo to configure it so something a little main stream and in the Windose or Linix world would do me best, but that aside if you could choose a firewall software to go it's own box what would you use. We decided to make our own with BSD but after a second thought and before I spend 2 months (exageration) configuring this thing I was wondered what other people feel works best.

Thanks