Moving and leaving family..

So im not actually moving.. yet. but I know eventually I'll probably move out of state. I live in Santa Cruz and its ridiculously expensive.
I'm just finishing school in the medical field and hoping to get a job some place that's cheaper, living wise.
I've mentioned this to my family, we're all really close and my sisters are really close to my DD. When i hinted at this my one sister started crying at the thought and my other sister has brought it up everyday since ive said something. and usually she says, "your never gonna move." or she'll say to my daughter, "tell momma your never gonna leave us". (which pisses me off)
They say im selfish for taking her away from the family. And if i had a choice I would stay. obviously.
I just feel like I'm doing whats in the interest of my daughter. finding a place I can afford so I dont have to live with my ex MIL. I can choose where it is (obviously according to housing expense and job opportunities) and what kind of place i want to raise my daughter.
Has anyone else gone through this with family. Its getting annoying, hearing there sobbing about being selfish and how I 'CANT' do it.. When in the long run, its to benefit my 'family'
Thoughts? Personal Experiences?

I'm going to be moving from Vancouver to Calgary sometime this summer. My family was upset at first but I showed they the school ratings and the crime rates and they decided that I obviously was doing it for LOs best interest.
They will come around eventually in most cases.

We moved from San Diego to Idaho. My family is in California. It's hard, I miss them and I felt guilty taking Hailey away from them, and most of them haven't even met my son. But we can live comfortably here. We bought our house, a newer car, and there we struggling even to make rent. We just visit often.

I moved from Maryland to Virginia and when DH was due to separate from the Navy we were at a toss up between Maryland and Texas, and Texas won. My family wasn't thrilled nor were my friends, but they were supportive. I had my family in mind and DH and I chose what was best for our family.