Aha! *nods* I agree with everything you said willo. I don't think Elizabeth regretted marrying Will one bit but she probably wishes he could be with her instead of out at sea and even then she knows that things are as they should be...Will needs to be captain of the FD for the time being. He is after all the one person who would certainly do the job right.
Willo I agree that her relationship with Jack was lust based and to everyone's amazement in the end they managed to be very playful friends...sorta like friends/sibling who tease each other...though I won't say that I (personally) don't still see a spark of something more but this isn't the time or the place.
As for James. There's definitely a soft spot there and I really think she did regret not getting to know him better and not giving him a chance. She did judge rather quickly after all...not fair right? Perhaps if marrying james hadn't seemed forced and she just happened to meet him some where...and if Will was out of the picture...who knows? Maybe she and james would end up together but Will is the love of her life and I don't think anyone can compete with that.