Paris is definitely a great city to visit. It has a lot to offer in culture, history, sight-seeing, entertainment, shopping, romance, diverse food, etc. The city is indeed quite expensive, but you can easily stay on budget if you are flexible. If you'd really like to see the highlights of Paris and to take your time for it, make 5 days off to do so.
Insider Tip:One weekend is actually not enough for Paris. 5 days are exactly enough to discover the great highlights of Paris and to really take your time see all of them. Obtain the Paris Visite Pass, which is very handy for public transportation.