Transair. Pooleys, spend a couple of minutes on the website and decide based on price. Personally I find Transair poor value. However from memory the Belgium chart can be hard to get hold of, so if XYZ have it buy the rest there.
The Vol a Vue 1:1,000,000 fight planning charts and danger area stuff is very useful for France - but you can probably get most of that from nav2000.com. I think there is a later, better version nav3000.fr.
For what it is worth try to arrange your flights over lunchtime when in France - most of the country is closed at lunchtime which really helps you. Just make sure you get fuel before or well after lunch - otherwise it is an enforced lunch at whatever airfield you are at - but at least most have restaruants!!!
And leave plenty of time in the evenings for browsing menus