OpenBSD/NetBSD/FreeNAS/freeBSD for internet server?

Would you recommend which OS (OpenBSD/NetBSD, freeNAS or freeBSD) I can use for Gateway/Firewall/NAT/DHCP/DNS/Web Cache Proxy(Squid)/File sharing(NFS, samba)/PPPoE/Mail/Web servers?
 
PFsense is first and foremost a firewall/router, not a 'public server'. Might as well use FreeBSD then.
 
I don't want to turn anyone away from FreeBSD, but (depending on hardware) I would tend to want to use OpenBSD on a low-power chip like the Atom (at least until my httpd really started bogging the whole mess down). On the other hand, you probably won't have as many options as on FreeBSD. On the gripping hand, once it's configured and locked down, you probably won't notice any difference.
 
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