thanks for the kind responses and thoughts, everyone!
just wanted to report that i took my final trip home to visit family before my move next month (and attended a cousin's wedding, ironically enough). it was VERY tough saying goodbye to my mother and she's still struggling with it, but i also feel more at peace with my decision. also, after talking with her some more about wedding stuff, she eventually did say she would come if i really wanted her to, but she is afraid she will be too upset because to her it represents that i will never live near her again.
my cousin's wedding made me realize all that i will miss out on (and all that he will miss out on if we were to have the wedding in my home state) but i also think it made me realize that a big, expensive, elaborate celebration is just not where we want our time/money to go over the next year.
i think we're pretty set on eloping to hawaii and getting married on a beach. my grandmother's family is from there and i've never been, so that will make it feel extra special. it will be just us and i think i like the idea of that better than a traditional wedding, after all. we may or may not plan a small reception in england later on....verdict is still out on that.