I think the key to a cultural victory is city states. Next to that would be puppet states. This makes Greece the best candidate for the job. His relations with city states are unparalleled and his early military units are fairly dominant.
French is a terrible idea for cultural victory. More Cities = 33% more culture required (additive from what I've heard). OBVIOUSLY the +2 per turn can't possibly make up for that. Quite honestly I rather be the Romans so I can build my monuments 25% faster. That's how useless France is in a cultural victory. France is good at having high culture, but it could never even out. I will say this however. If it counts for puppet states then maybe I'm wrong.
As far as number of cities. I think 3-4 is the "sweet spot" with the rest being puppet states with trading post spam. I'd recommend more production-focus for your capital and more trading post heavy for all other cities. Farms are typically useless if they just add food. You'll get all the food you need from city states.
For social policies. I'd get the 1st two in Tradition for wonder production. Then get a few from patronage to help your city state relations. Then max out Piety. go back and finish patronage. Then either grab the rest of tradition or move on to commerce to help pay for your puppet state's urge to have the highest maintenance possible. And finally. The last one doesn't really matter. Rationalism, Freedom, Liberty. doesn't really matter.
Wonders:
Highly Recommended
The Oracle - Effects: 1 Free Social Policy
Cristo Redentor - Effects: Culture cost of adopting new Policies reduced by 33%.
Sistine Chapel - Effects: An additional +33% Culture is produced in all Cities.
Stonehenge - Effects: +8 Culture
Sydney Opera House - Effects: Choose one free Social Policy.
Hermitage - Effects: Doubles output of Culture in this City.
(Build in Capital)
Recommended
Chichen Itza - Effects: Length of Golden Ages increased by 50%.
I think golden ages are the key to pumping out wonders and massing money for purchases, trades, research agreements, and keeping city states happy.
Himeji Castle & The Kremlin - 4 Culture each with no maintenance. They help with defending your empire
Taj Mahal - Effects: Civilization enters a golden age
This causes a 22+ turn golden age with Chichen Itza
Optional (Since you need the extra culture anyway)
Big Ben - Effects: Cost of Gold purchasing in all Cities is reduced by 25%
Helps you in emergencies and to boost production. Not necessary at all, but a decent luxury.
Angkor Wat - Effects: Culture cost of acquiring new tiles reduced by 75% in every city.
Bigger city boarders for less gold spending. Not a bad perk for getting more useful tiles
The Louvre - Effects: 2 free Great Artists appear near the Capital.
2 Free Golden Ages
The Porcelain Tower -Effects: A Great Scientist appears near the city where the Wonder is built.
The only reason I get this is because I typically don't have other wonders I want to build when this is available.
The Great Library - Effects - 1 Free Technology
This is pretty standard
The Hagia Sophia - Effects: Great People generate 33% faster.
More Great People = More Golden Ages
Well. That's just my 2 cents