Multiple NICs or Virtual Is
Simple question. I have 5 static IPs, What is my best course of action: Add more NICs and have multiple physical ports; one for each IP. Or go with one physical WAN port and virtual IPs.
Multiple NICs in the same wire on the WAN side and with IP addresses from the same range would be quite problematic, use virtual IPs instead.
If possible ask your ISP to offer those 5 IPs (I take the subnet is a /29?) as a routed subnet with a transit network on the WAN side of pfSense, that would be the optimal solution.