Poly GV for your dates would be $2357.18.
The rates vary at all of the deluxe resorts. Generally, the WL & AKL have similar rates, as do the Epcot resorts (BWI, YC, BC). The monorail resorts have a scale all their own, but CR is generally the cheapest, followed by the Poly, and then the GF.
You can not turn a BRP discount into a package. With an AP, you can buy the Disney Dining Experience card, which will save you 20% on the majority of your meals at sit-down restaurants, and a few select food courts.
I have no idea if the WDTC people would answer your questions - from what I've read, they've been a bit clueless on the BRP program, as it's basically supposed to be booked online. If you need help, I'd contact a TA that's a Disney specialist - they can book the BRP for you, and will be able to answer questions.
It's my understanding that you can purchase your AP over the phone, or on the web. I think you do have to wait until you receive the actual voucher in the mail before you can use it for the BRP (but someone correct me if I'm wrong). I had my AP before all the BRP stuff came out.