I was in your situation just recently
and we decided to make the move.
I had a newborn at the time. And the move was difficult.
When we got here, I was miserable. We are close to family, but all those good old childhood issues (remember those?) came into play as soon as we arrived.
But--time has passed (it's now been a year) and now I am glad we did it.
The house is MUCH smaller, but I've worked hard to make a new community of friends and now holidays are easier--just a few minutes away and we're at eath other's home for a holiday meal.
And now we can entertain family without having to worry about having them stay overnight (which is hard to do).
And it's funny how fast the people I left behind forgot us. And even didn't send Christmas cards for our first year away.
I guess my advice (although you probably don't need it) would be not to expect too much from your famliy as soon as you arrive. They already have lives and friends and you might feel frustrated once you arrive that they aren't more grateful that you are there.
Now--this is just my experience, things may be totally different for you.
And about money--I'm a stay at home mom on a tight budget, so the money is never an issue--otherwise, I'd work. Because it's the same argument (Can we afford it?) just in another avenue (extended family instead of immediate family). What I am saying is that money should never be an issue when it comes to the ones you love. They need your heart and time and memories, not your wallet. You'll be able to figure out how to survive on less. We did, and I have learned that there are places that have great things for tots to do that are free and that I can exercise without a fancy gym, etc.
But my kids LOVE being near grandma and grandpa. They really do.
Good luck in your move. Label all of your boxes.