If you're into a Megane RS, don't hesitate and buy one. Since owning a performance car in Belgian means comitting a crime and paying unreasonably high taxes (thanks to the new government), a few friends of me bought an RS and they're all very happy with it.
Very nice as a daily driver, and useable on a trackday. I've driven one a few weeks ago and was pleasantly surprised with it, and I'm a rwd addict. Another car in that pricerange might be a Focus RS, which also is a great drivers car, but a thirsty one. Bear in mind though that they won't have much space in the booth. However, over here you can buy these cars without the back-seats (guess it should be able to get them like this in France also), which leaves you with a bigger boot but no more seats in the back.
Prices in Germany could be interesting too, most of the time lower than France.