Sounds like a good plan!
You have to think about your future and what your best options are! That move sounds great, especially if you rent your current home to your daughter. When the market turns around, then think about your home in NJ and what the best options are for YOU in that situation.
As noted below, sounds like a no brainer!
I think your question would be better directed to a tax, financial and/or estate consultant. Most certainly an estate advisor as there will be items that need to be addressed if you have other children.
I might also ask how are u going to pay for the home in Delaware?
Francesca Patrizio, Broker, ePro, SRES
If you don't have to sell, then it probably also makes good financial sense to wait until the market stabilizes, but that also depends on which area you live in. Personally, if I was in a similar situation, I would probably not sell, since there is no reason to move up.