Is it worth it to buy passes for Paris attractions, do you know any specific pass for 5 days that covers the main attraction
This is the London forum.
It may be worth getting if you like to do multiple short visits to different museums rather than visiting, maybe only one museum per day. There is no 5-day version, only 4 or 6 days. No need to pre-purchase, you can buy it at any participating museum/attraction.
N.B. that one benefit of this pass is that it allows you to skip the ticket lines (but NOT security lines) - this is really only an issue at the Musee d'Orsay (and Versailles if you plan to go there), so plan your itinerary so that this is not the first museum on your list - you need already to be in possession of the pass in order to go to the ticket-holders' entrance.
The Paris Pass should be avoided. It is just a collection of existing passes put into an envelope and sold at a high mark-up.
As Sussexgirl says, the Paris Museum Pass can be worthwhile if you want to visit a number of museums and art galleries. The best solution for transport depends on how long you will be in Paris and what days of the week.
Also note if you go for the four day pass you have to use it it four consecutive days. The days start when you first use it not when it is purchased. We found it it quite useful and allowed us to see some attractions we probably would not have if we purchased individually, since some sites we only spent a hour or less. Another benefit is if you need a clean bathroom and an attraction is nearby and no other facilities you can use the pass.
For transport, you would probably do best to buy a carnet of 10 ordinary metro/bus tickets. If you use them all, buy another carnet.
How about buying a Hop On Hop Off Bus ticket? I think it would give the flexibility to just use it whenever you need a break and want to relax. Any ideas?