Ralts!!! I can't see that being likely but the Ralt F399 gearbox which is very trick could return to modern F3
05 - 07 spec Chassis - theres
Dome - abandoned but super fast - beats the Jap Dallara's but was only ever fitted with the Super Honda
Lola - did well in Germany but was never fashionable
Ligier - only one ever built? - driven by Hulkenberg - nice looking
SLC R1 - abandoned but very strong aerodynamically
Mygale - Increasingly competitive but not as quick as the Dallara yet
Dallara - still the benchmark
The Lola maybe better than the Dallara or at least its match but it doesn't have 90+ drivers running and developing them. The Dome was a wasted opportunity.