I'd get a preferred room at POR and save the $375.
If you book preferred, you are guaranteed to be close to the food court, pool, etc. POR is a lot bigger than POFQ, but if you stay preferred you won't have to venture into the outer regions of POR unless you want to go exploring.
If theming is important to you, keep in mind that all preferred rooms are in the AB section of POR, not the mansions. (FWIW, we prefer AB, but obviously different strokes for different folks.)
POR was just renovated in 2011-2012, which i think was after POFQ. The rooms are really nice.
Obviously everyone has different preferences when it comes to resorts so realize this is just my opinion, but DH and I strongly prefer POR to POFQ. We stayed at FQ once when it was really hot, and the whole resort just felt broiling to us - the courtyards have a lot of concrete that reflect the sun. The AB section of POR is a lot more lush and shady. I just mention it b/c if you're getting a "summer" discount, I presume you'll be there when it's warm.
I'm sure others have different opinions, and in fact one of the reasons we stayed at POFQ was because of glowing reviews here, but after staying at POR we'll never go back.