It has to be sestertii as the size of them allows for the engravers to show the best of their skills Q
I think that coins with an unexpectedly naturalistic portrait are winners in my book. Shiny gold does not a pretty coin make, IMO.
When you have only a limited budget it is possible to create a much eye-pleasing collection of Roman coins by focusing on common coins, very common, but from elegant dies and in very good condition. For example, this antoninianus of Volusian : Volusian (251-253), AR antoninianus, Rome Obv.: IMP CAE C VIB VOLVSIANO AVG: Bust of Volusian, radiate, draped, cuirassed, right Rev.: VIRTVS AVGG: Virtus, helmeted, in military attire, standing left, leaning on shield, holding spear in right hand; in field, star RIC IV Volusian 187 Such a coin has nothing particularly valuable : it is in much debased silver and is just grey, not shiny; it is not rare at all (these mid-3rd c. antoniniani have been found by the tens of thousands in innumerable hoards); this emperor is not an history star like Nero, Trajan or Commodus... In fact most people don't even know he ever existed, he is known only by specialists or coin collectors. He never did anything noticeable, was emperor only because his dad was already and was soon assassinated together with him by mutinous soldiers without even pronouncing any famous last words... He never led any military campaign when Goths and Persians were wreaking havoc in the Balkans and in Syria, never commissioned any monument in Rome or elsewhere, never did anything funny like making his horse consul or fighting as a gladiator in the Colosseum, never organized any orgy worthy of being recorded in the annals of debauchery or perversion, and I read in Wikipedia that in 3 years he co-signed with his dad two laws only. A poor resume indeed. But the coin is nice, every hair is still visible, I like that smile on his face... Another example of very common eye-pleasing coin is this one : Time of Constantine I: AE nummus of follis, Antioch Obv.: CONSTAN-TINOPOLIS, draped, helmeted and laureate bust of Constantinopolis left, sceptre on l. shoulder Rev.: Victory holding sceptre and leaning on shield advancing left on stylized galley, exergue S M AN I These small bronze coins minted under Constantine with the bust of Roma or Constantinople are probably among the least rare of all Roman coins. But its smooth surfaces, its good condition and the wonderful desert patina make it look like some black gem. Even more, this time, there is some history about it. The reverse celebrates the naval victory of Chrysopolis, a battle between Constantine's and Licinius' fleets on 9/18/324, won by Constantine who became the sole ruler of the previously divided Roman Empire. Immediately following this, he refounded the old Greek city of Byzantium, overlooking the battle site, and made it Constantinople, which became the new capital of the empire for the next 1600 years...