I enjoy the virtualtourist.com site. They have forums, but I've never used them. Great site, though, with TONS of first hand information. They let you do trip journals there, which is fun.
I don't know how they behave on travel forums, but we found the French to be nothing but lovely and pleasant during our Paris trip. Can't wait to go back!
PhotoBearSam - Paris is actually a fairly inexpensive city to tour. 2 euro bottles of fabulous red wine, 1 euro loaf of fresh baked bread from the boulangerie, a few euros for cheese and butter from the grocery, and you've got yourself a heavenly all-day picnic lying in the grass, gazing at the Eiffel Tower. At least, that was the best day of our trip. And, Paris is really pedestrian friendly - such a pleasure walking anywhere. Other than the famous #69 bus, we didn't use transportation during our entire stay (except for arrival and departure, of course)
I'm sure the info I've given here isn't anything you didn't already know. But, it is kind of hard to guess someone else's spending needs. I just know for us, it was an extreme budget trip, and we had a fantastic time.
Post a trip journal on virtualtourist.com (or here) for us when you get back!
Bon Voyage!