Nearly a year later, wanted to give an update on the current state of the set:
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Upgrades:
Augustus - Colonia Patricia AE RPC 130, lifetime issue, very worn but with a nicely contrasted portrait.
Nero - Victory As Lugdunum Mint RIC 543, better than the previous but that's not saying much.
Commodus - Libertas Denarius RIC 135, AE to AR upgrade.
Elagabalus - Uncertain Moesian AE, Nothing left on the reverse but portrait is solid.
Aemilian - Viminacium AE RPC 89, Actually
cherrypicked at the World's Fair of Money this year. It was in a 9 coin unattributed lot that ended up being about $10 per coin.
Gallienus - Sol Antoninianus Mediolanum Mint RIC 495, I like the Mediolanum portraits and this is a nice example.
Claudius I - Uberitas Antoninianus Siscia Mint RIC 193, better all around.
Probus - Victory Antoninianus RIC 215, portrait is clearer albeit smaller.
Numerian - Numerian as Caesar Antoninianus RIC 263, makes nearly the whole row Antoniniani which I like the idea of.
Additions:
Caligula - Thessalonica AE w/ Antonia Minor RPC 1573, Caligula side is worn and off center but the Antonia side is pretty nice.
Otho - Securitas Denarius RIC 8, was in a NGC slab but no longer.
Maximinus I - Pax Denarius RIC 12, Christmas 2022 gift to myself.
Saloninus - Spes Antoninianus Asian Mint RIC 36, wasn't going to add him to this set but found a coin for a good price so might as well. Definitely need to upgrade though, this is probably the worst coin here.
Constantius I - Constantius + Jupiter AE Cyzicus Mint RIC 19a.
Maxentius - Castor + Pollux AE Ostia Mint RIC 35, again wasn't going to include this guy but found a decent one.
Also, I am holding a show-and-tell contest at the moment with a two Roman coins as potential prizes if you haven't seen it yet:
http://goccf.com/t/454952