As usual with these replies it depends what you want. We favour sites towards the CL end of the spectrum.
Starting north east the municipal at Sisteron south of Grenoble is excellent, big pitches, and quiet. Sisteron itself quite interesting in a 'border town' sort of way - best supermarket etc. about 5 miles south, but some excellent drives all round. Then a bit further south east near the Gorge du Verdon a Dutch owned farm site near Riez - Vauveniers - very quiet, beautiful views, huge amount of space available off-peak (closes end September). The sites at Moustiers themselves are very congested and busy. Nearby Lac St Croix has a high season site. (all in CC book).
To south west Arc en Ceil site at Rouissillon not bad if a bit shaded. Town very interesting- pigment mines for famous painters etc and excellent local wine. Good day trip north up Mt. Ventoux beloved of Tour de France fans - see wheere our one-time champ. Simpson literally died within sight of the finish line. Otherf good camping a la ferme on raod from Apt to Cereste (but not in book) signed from road direcection Celleste. Le Clerc and Intermarche in Apt. Beautiful quiet countryside around with many good cycle routes if you are that way inclined.
Off peak very quiet and enjoyable - high season I'm not sure I'd risk it, but others may not agree.
May see you there September / October 2011 !