Ron, here are my thoughts....
5-6 days in Paris -
Day one - buy 2 day pass for hop on/hop off tour; spend most of day one recovering from jet lag (assuming that your flight arrives around noon) Ride the bus tour to get a sense of the city
Day two - use the bus tour to get around i.e. hop OFF a lot!
Day three, four - visit some of the other sites around the city. See the department stores (even if you don't shop there they are worth a visit!)
Day five - consider a visit outside Paris - perhaps to Versailles
Day six, seven - take the RER to DLRP and spend two days there
Day eight - fly home
What sort of price range are you looking for in Paris re hotels? You don't need to be right in the centre to enjoy the city. You could be in the La Defense area for instance and get to the centre very quickly on the metro/RER. Plus if you are at La Defense you will be near the red line RER which will take you to DLRP. Hotels right in the ‘heart’ of things can be very expensive if you are looking at the chain hotels, so consider being in a neighbourhood or looking for an independent hotel or a French chain if budget is a concern.
Rather than just look at location, consider a hotel near a metro stop. I was in a neighbourhood in the midst of nowhereland, but was only 20 minutes via metro to CDG Etoile, the station for Arc de Triomphe and Champs Elysees. The metro stop was outside my door.
There is a good thread on Paris on the Budget Board as well. Here is the link
http://www.disboards.com/showthread.php?t=1307736
You should also check out
www.ratp.fr - you can set the site to English. It will tell you how to best get around using metro, RER, and bus.
There are a lot of guidebooks out there - find the one which seems to best mesh with your travel style before investing in one. Some focus on budget trips, others on 'off the beaten path', etc
I would also go to
www.flyertalk.com and check out the Paris section for more good advice
For bargain shopping, check out Monoprix at several locations. For excellent baking, the chain Paul is located throughout Paris. For groceries, Monoprix or Franprix are good. Grocery stores are a great place to find souvenirs, by the way!
Hope that helps for a start - if you have specific questions feel free to PM me