Could you benefit from a service loan car experience?
Lexus Edgware rd service dept are always pretty obliging and I've ruled out a couple of cars after getting them as loan cars, like the ct200h's too small with a harsh ride, and the is300h wasn't right for me right - it was very good, but I've been pining for a hatchback since my 4th gen Celica. They offered me a NX, while its really the RX I want to experience, but they couldn't do it - but you shouldn't have a problem getting a is300h, as they seem to have loads of them.