In London I paid frequently more than $ 400 for two - and I have to say that I was disappointed most of the time.
We had Dinner at BocuseŽs restaurant in Lyon in March and paid some 300 Euros for two for a 12 course dinner and wine (although my wife was pregnant which limited the bill a bit). This was by far the BEST meal we ever had, I can only recommend it to everybody. Try it on your way to southern France or when in Geneva (90 mins drive).
An also very good and inexpensive Restaurant is BocuseŽs school for waiters and chefs (also in Lyon - Ecully, Chateau du Vivier). They serve dinner for guests only Fridays and Saturdays with the "pupils". The food is excellent and service is great fun if you have a waiter that just started his 3 year course and is completely clueless. This showed me that a world class waiter is actually highly trained... Meals cost around 28 Euros - a steal and youŽll have fun being a guinea pig
Christian