I love Targassonne, but apart from bouldering and walking it's fairly quiet (which I like!), if you want some thing a bit more 'adventure' for the family you'd be better based in the Ariege which has a lot more developed in the way of climbing, canyoning, kayaking, rafting etc.
Targassonne does get a lot more sun though being on the sunny side of the mountains. But then again ariege doesn't have much in the way of bouldering. Look at the areas around Aulus-les-bains, Vicdessos, Auzat. I personally try to get away from the road that runs from Foix to Andorra when looking for places to stay.
However John Arran's place is nice and he knows plenty about the climbs in the area.