KAYgo, we made the move 2 years ago (to midi-pyrenees) and don't regret a thing!
Don't know the Limousin at all but aer lingus fly into Bordeaux with fairly good offers from time to time.
Loads of advice on offer on this forum [broken link removed]
and also this one
Mostly English people posting there - although the Irish are arriving! and I'd say a lot in the areas you're thinking of.
Although those on the forums may say otherwise (many work in the trade), I would say to avoid the English-speaking agencies, or use them to get an idea of what you're looking for, but buy through a French agent.
Bonne chance!