Bienvenue chez les Ch'tis (it was shown in the UK as Welcome to the Sticks) is a great laugh...
In the thought-provoking, emotional but not too heavy (!) category, I would recommend:
L'Homme du Train - two superb performances
Confidences Trop Intimes (Intimate Strangers) - sexy, sophisticated, surprising drama
Il y a longtemps que je t'aime (I've loved you so long) - a careful, well observed emotional study with an absolutely brilliant central role by Kristin Scott-Thomas
La touneuse de pages (The Page-Turner) - kind of a classic revenge drama
For an Amelie-style fix:
Faubourg 36 (AKA Paris 36) - great feel-good 1930s Paris-set musical drama with its heart and its politics on its sleave
Un long dimanche de fiançailles (A Very Long Engagement) - just because it's the same team, but it's far sadder and darker.