In reply to Oogachooga:
I wouldn't really bother with any sport crag within 150 miles of Font. While Saussois and nearby Surgy have some brilliant routes and are among the oldest developed crags in France with rich history, they're also the most polished bits of rock I've yet set foot on. Surgy maybe a little less bad, while Saussois has the nicer setting (it is actually rather pretty). Polish shouldn't be yoo much of a problem from 7a upwards though.
A bit further (~2 hour drive south) is Cormot, it's a more blocky type of limestone but features long committing routes (often 35m) with a somewhat alpine feel (lots of cracks, dihedrals etc). Historic crag too and not polished. Mostly routes in the 5s and 6s. On the other side of the valley is Baderne with routes starting at 7a up to 9a.
I really wouldn't bother with the Viaduc des fauvettes, I mean it's decent for locals but I'd rather do long easy circuits in Font. Parts of it do stay dry in the rain though (obviously).
There's some limestone quarries north of Paris like Saint Maximin but they look dreadful.
Haven't been to the chalk cliffs west of Paris (Andelys/Connelles) but they may be an interesting diversion, with the caveat that after winter holds tend to break so grades may not mean much! A new guidebook just came out, it's called Escalades dans l'Eure I think.
Post edited at 18:58
