Wow-- I am 22 and would kill for a boyfriend willing to do something like this.

For a romantic get-away, I would definitely go with either the AKL, WL or Swan/Dolphin.
In regard to the WL vs AKL, I would choose whichever resort theme most appeals to you. I much prefer the food at the AKL (Boma and Jiko are amazing), but certainly appreciate the location of the WL. The pool at the AKL is much larger than the WL pool, although both are equally fun. Rooms at both resorts are the same size, although I prefer the room decor at the AKL. Thankfully, I believe the WL rooms are about to receive a much-needed refurb.
Long story short, I would look at pictures of both resorts and go from there. It sounds like the WL theme excites you more, so go for that! Just make sure you pay the AKL a visit one night for dinner since it is truly so distinctive.
I would choose the AKL/WL over the Dolphin/Swan, but would choose the D/S over any moderate in a heartbeat! The resort themes are not my favorite (although the Swan is a bit more romantic than the Dolphin), but the location cannot be beat. The resorts are located right next to the Boardwalk, which has a lot of nightlife options that would be great for a young couple. Epcot and the Studios are super close too. The restaurants at the S/D are also fantastic (Il Mulino, Bluezoo, etc) and I have heard great things about the pool as well.
Let us know where you end up!