thats pretty much it, although you might consider
do you need f/wall switch - or can you just run f/walling s/ware on each box ?

a xover cable so you can connect nic2 on each machine with local lan ip's 192.168.x.x - keeps the in-switch traffic down

multi-home/bgp4 data-transfer a must

find out about access to your kit 0 even if you dont expect to go, what are the procedures if you need to get into redbus ..

think about renting somespace ona NAS or external server for backups/archival

find out if you get remote reboot facilities - always useful

HTH