I would really recommend looking out for a good grade, well struck example from one of the mints with fine style (e.g. Antioch). In my opinion, when these are good they are very good.
Whilst this one is common you don't always seem them like this.
Constantius II - AE2
Obv:- D N CONSTANTIVS P F AVG, Pearl diademed, draped, cuirassed, bust right
Rev:- FEL TEMP REPARATIO, Helmeted soldier to left, shield on left arm, spearing falling horseman; shield on ground at right. Horseman is bearded and falls forward reaching towards emperor (type FH3)
Minted in Antioch (Gamma | _ //ANS). A.D. 350-355
Reference:- RIC VIII, Antioch 132

Regards,
Martin