My last Prius was a 2012 T3. 2012 onward is a good move, as they made some worthwhile changes, like stiffening the chassis to deal with complaints of rattle and creaks, Daytime Running Lights, electric folding mirrors to name a few. I chose a T3 because at the time it had 15" wheels whereas T4/Spirit had 17".  The 15" meant its CO2 was low enough to get a London Condensation Charge exemption at the time.  The only thing it didn't have that I really wanted was Cruise Control, but since