Went through the same thing with my W. She went through a long phase of wanting to move about 4 hours from where we live. Would spend hours online at work looking at houses online and send me link after link. What I wanted to say was:
Are you f ing crazy? I don't have a job there!
Or
Are you f ing crazy, we just moved into a new house three years ago and these are 50% more expensive!
Under either scenario, she is f ing crazy. What I learned here was listen, ask questions about why she likes that one, does she like the neighborhood, etc. and worry later about whether you are really going to need to make a choice. In my W's case, in a 3 month period she completely shifted back to wanting to live in our town. There were some times I asked if she thought we could afford it, but primarily I tried to listen.
CB
Me; 42, W; 43 M; 16 yrs S12, D9
3/13 - "I want to move to XYZ City (four hours away) and it might be without you, not sure" 5/13 - "Not sure I meant that"