The original plan was to use two Atom based pfsense boxes. The S1260 based Atom machines I can't get in time. Also I need two NICs (one to each switch) for data and one for heartbeat. The new SM offering has a dedicated IPMI port but you need to use PCI for the third NIC. Buying the D525 based machines would work well, but at around $350 with tax and ship each + memory + a 64GB SSD + shipping to the DC they are at minimum a $450/ea proposition. Conversely, my hardware cost for adding 2x single L5520 Dell C6100 nodes is about $0. Bringing the second chassis online would cost around $50/mo to be safe power wise. I think there will be a lot of idle time so probably do not even need this, but just in case. $900/50 = 18 mo payback plus I also have the capability to have a second hot swap chassis online or have a hot spare node if necessary. Space wise both solutions take 2U (2x 1U Atom machines or a second C6100 node.)Single L5520 for pfsense(or similar) load balances?
Still mulling it a bit, but that may end up being the pfsense/ HAproxy solution.