My parents went thru the depression and war as kids and anti-debt is encoded in my DNA. It has led to less-than-optimal choices.
That said, you should do what gives you the most flexibility with acceptable debt risk. Where do you want to be in 10 or 20 years? How many kids will you have? How much room do your hobbies require? Do you like the neighborhood.
What about something between option a & b? Maybe you're growing out of your house, but you don't need 1200 more sqft. Maybe there's a nicer neighborhood, you could design something to your needs or resale will be more profitable.
Are you really at risk with equal or greater debt? Can there be a situation where your industry could collapse and banks won't be interested in negotiating? If you have a fear of a 2008 event, debt will be managed unless you are really over-leveraged and there's a market for your property.