Although my husband and I are a little (ok, maybe a lot) past our 20's, we also like a little night life on the trips we take sans children. I would not recommend either POFQ or POR. In my opinion, while possibly romantic, they are BORING!! I was so looking forward to staying at POFQ, but was disappointed that it was like a ghost town after dark! Depends when you go, but there was no one in the lounge ever while we were there. (To be fair, you can take the boat launch to DTD where there is plenty of night life. We found that to be a little inconvenient because you can't just walk across the property to your room - you have to walk to the boat, then wait for the boat, then ride the boat, then walk to your room, you get the idea....... )
I recommend one of the EPCOT resorts. The Swan and the Dolphin often have specials that make it more affordable.
I have not stayed at CSR, but think that for a little nightlife, it's a MUCH better choice than either POFQ or POR. It is partly a convention hotel, so there has to be somthing to do to keep those conventioneers busy............