Paris metro fares and museum entries?

Travel Info
I'll be in Paris at the end of the month for 5 days. What is the best metro ticket to purchase for travel in and around the city daily for 5 days? I'll be there from Thursday through Monday; I've read that weekly passes are only valid Monday through Sunday. And I've also heard about buying museum passes in packages from the metro stations - are these a good buy? Or is using a student ID at each museum a better deal?

Travel Tips

The weekly metro pass, the Carte Orange, probably wouldn't be your best bet...It is a great deal...but I think the last day to purchase one for the week is Wednesday.

A carnet of metro tickets is a great deal...cheaper than buying them individually.

The museum pass is a great idea...in fact, I would not go to Paris without buying one. You can get them at any metro ticket booth. However, they recently changed the pass. It is now good for 2, 4 or 6 days. I'd get a 4-day pass and pop into a museum whenever you feel like it.

With the museum pass, you get to waltz to the front of the line at most museums. At Versailles, there is a separate entrance for pass-holders. There is a separate line for pass-holders at the Musee d'Orsay. It just saves a lot of time and hassle. Why spend time waiting in line to purchase a ticket when that time could be spent seeing the wonders of the museum?