My experience is a bit dated, since we relocated here from Tampa 3 years ago, but this was our scenario:
We moved before our area had a huge housing boom, so for us, housing was lateral. You'll find housing now to be much cheaper in NC. (Wake County's median home price in February was $189,100, average home price $264,355.)
Insurance - dramatically cheaper!! Our 2100 sq ft home runs $35/month. Really.
Property taxes - dramatically cheaper!! Estimate 1% of the sale price for your budgeting purposes, less if you're not within the city limits.
State income tax - Here's a link to give you the scale. This was a big question mark for us, coming from Florida, but we found that the savings in other areas more than made up for it. http://www.dornc.com/taxes/individual/rates.html
Food - at least 3 years ago, we found it to be a little higher here.
Gas - about the same. I filled up for $2.59 yesterday with the cheap stuff.
Utilities for my 2100 sq ft house:
Electric: summer high, about $170, winter low about $35
Gas: winter, highest ever about $210, usually 160-180, summer low around $20, if that
Cable: same as FL
Water: Billed bi-monthly, summer about $100/2 months, winter about $40
Phone - dropped the land line when we moved here - they wanted $50/month with no long distance. Forget that.
Then, there are the intangibles - quality of life. I wouldn't move back to Florida, even if it was cheaper. The pace is a little slower, the weather is milder, and overall, we are just happier here, for all the reasons you see in other posts. For all the budgets and number crunching, really it comes down to where you'll be happiest living your life.
Come for a visit, and welcome to NC!