FreeRadical said..
I reckon earlier Beneteau's (circa 2000 or thereabouts) are pretty solid (eh Toph!).
Nothing wrong with an ex charter as they usually well maintained but have high usage. Just need a good look.
I am very happy still with my Benny for the type of sailing that we do.
Personally, I don't concern myself too much with high time engines on any of the boats I have owned. I would prefer high time but well maintained over low time and not maintained. As FreeRadical said, charter fleets are usually well maintained.
What I found though when looking at a few ex charter boats, was that they tend to be very light on appliance and instruments. Depending on how many previous owners have added there bits, you might want to budget on a few upgrades.