After a great deal of back and forth, I've decided that my next challenge is going to be the Catalina Channel. It's a similar length of swim to the English Channel - 21 miles from the island of Santa Catalina to the mainland to the south of Los Angeles at similar water temps to the EC, but with less tidal influence. A very exciting prospect, a tough swim, and a great chance to build on this year's swimming.
None of the details have been ironed out yet, but that will get done as and when. The important thing is that I've decided, and now I can start focusing on what needs to be done to make this happen.