I haven't found any real solid answer on which of the above methods is the best for traveling around in Paris, and perhaps in the surrounding environs.

The Visite card from what I gather is what they try to push on tourists. It apparently comes with some small discounts at infrequented sites.

The carnets are simply 10 metro passes bundled together.

The Carte Orange (think that's the name) is a week long (calendar week starting Monday) pass good for metro and bus that requires a photograph. From what I've read, they aren't real eager to sell this as it is intended more for Parisian residents.

Can anyone help clear up what the best plan would be? I'll get in on a Saturday and leave the following Sunday. We might have a few days out of Paris (Versailles perhaps). I think we'd do a lot of walking, but in Rome we had a few days where we were on the subway several times in one day, same in London.