Sorry I haven't replied to your final thoughts yet! I was out of town and read them on my iPod Touch while gone, but it's too much of a pain to type on that.
Anyway, I can relate on the small trip vs. long trip thing. Our first trip (Sept. '09) was 4.5 days and we sure could have used a vacation after that commando-touring! So, our second trip (Jan. 2010), we made a point to relax and took 10 whole days. Nice!

This last trip (June) was back to the insanity again (I'm still not entirely sure I've recovered from the lack of sleep on it!), but I think it helped that we'd taken a long trip recently and we know we'll be returning in Nov. (for a short trip).
So cool that you'll be taking a nice, long trip next year! If you are going in 2012 too, as you mentioned, I would recommend the Annual Passes. We got them this year and, if you are taking two trips, they'll pay for themselves in just ticket prices. However, they'll also give you nice resort discounts. From the little experience we've had, I think you could get at least 40% at Deluxes and at least 30% off moderates. This year's AP discounts for the time of year you're going (Aug. 15-Oct. 2) are 35% off values and moderates and 42% off deluxes and villas.
As far as the resorts you're considering, I don't think you could go wrong at any of them. On our January 2010 trip, we spent the first night at the Poly, the second night at WL, and the rest of the trip at POR. Loved all of them. We did especially love the Poly, but had no complaints about any of them. (For what it's worth, we booked them with a PIN before we had APs and got 40% off the deluxes and 35% off POR). A couple things about each:
Poly: loved the tropical and relaxing theming, the convenient transportation (to MK and Epcot, we didn't try anything else), the restaurants, the beach, and the pool with volcano slide was cool
WL: loved the lodge-y theming, the hot tubs, and the boat to the MK
POR: loved the beautiful river running through it, the create-your-own pasta bar, and we had no trouble with our transportation (we were in a building very close to the main building/bus stop). We didn't swim there, but the pool looked very nice.
And, hey, if you can't decide, you can always do a split stay like we did (book room only-which you can cancel up to 7 days before, by the way-and use APs for entrance to the parks-no package needed). We had no trouble or inconvenience from switching resorts-just costs a few extra dollars in tips for them to move your luggage.
Sorry for the long-winded answer! Anyway, I really enjoyed your TR

and look forward to the PTR!