Towers vs. Poly
Well.....I have a feeling that most people on these boards will say go to the Polynesian. Personally, i have always loved the Contemporary. Nothing like waking up, walking out of your room and having the monorail RIGHT THERE. Want to eat breakfast?? Go to the concourse and eat while the monorail passes right above you!!! I must say that it is truly wonderful. I simply LOVE the Contemporary.
If you have been down before, ask you kids what they thought about Adventureland in the Magic Kingdom. One reason I like the Poly so much is because it has a very "Adventureland" feel to it, and Adventureland happens to be one of my most favorite land in the MK.
Bottom line, both places are wonderful to stay. Actually, they are some of the most incredible places you can stay at in the WDW vacation kingdom. I am a DVC member now and stay at the Boardwalk, putting me right in EPCOT Center's backyard (my fav park). Hope this helps in your decision making. Post questions if you have them. I will try to answer them.