You will absolutely LOVE the Poly. I love walking around to the Wedding Pavillion and GF in the early morning... so peaceful. The water mouseboats are fun in the morning too.
We are waitlisted at BWV, VWL, BCV... so far no luck, so we're staying at AKL (124.00/night) We will probably head to MK first thing on the 4th. We were there in 1999 and had a great time... lots of red/white/blue. You will have a great place to view the fireworks from the Poly beach... far away from the crowds. I just read another thread which said the GF had their own fireworks one year!!! We wanted to stay in a monorail resort to be close, but not in MK when the fireworks went off, but unless the waitlist comes through, we'll be at AKL. From what I've heard, Epcot will be less crowded. We'll probably see the fireworks there. They are supposed to have a patriotic fireworks show after Illuminations. Crowded or not, I'm glad we're going! ENJOY YOUR TRIP!!!