Wow on those denarii. I think when it comes to coins, @Barry Murphy might be like the guy that when you tell him you like a band, he plays you a song from the b side of a record that was only sold in Japan under a fake band name with 10 copies going out. In other words, he knows coins that we mortals have heard about in whispered tales. Those coins in that condition are really tough pieces.
Is Philip I even attainable? Can find very little about his denarii online. Good catch, will add those two. Wikipedia and some other sources don't recognize Clodius Albinus as a legitimate emperor, I guess because he declared only after Septimius Severus declared? I will probably skip the other usurpers though, including Caurasius. And yeah, I did a more formal price estimate through coinarchives and came up with $21k as an absolute best-case scenario and $30k as a more reasonable number.