Thanks again for all of the responses. Yes, I know about that additional 20%-off Orbitz deal. The rate for 4 nights for Pop Century is $465 inc. tax using that deal. The promo is still valid for a while, and the codes are HAPPY20 and TAKE20 if anyone is interested. Weve ended up going for that option!
Although it is a great deal for a Disney hotel, it wasnt really what we were shooting for. In short, we hadnt planned for this trip in advance, and had therefore put aside zero in savings when we decided to book and go (last week!). For that reason, we really did want to spend as little as possible on a hotel, so less of an up front outlay, and have the next 6 weeks to save our paychecks for fun" money so we can enjoy our trip with as many taxis/meals/souvenirs/cocktails as we like when the time comes! (I should also add that neither of us operate using credit cards so it was real expenditure at point of purchase, haha!).
Most of the responses are geared toward total spend, which wasn't really a determining factor for us. I probably should have mentioned that at the start.
Even though we buckled this time and went for the Disney option, hopefully the creative responses above will be super useful to anyone in our situation in the future!