I'd say that in uncertain markets, it's new build if you're going to stay in the house until you die, and existing house if you're probably going to move or trade up again, but homes are too personal for generic advice to apply to all!
After we moved ourselves to our current house thirteen years ago, renting a U-Haul and two teenaged boys, I told DH that the next time I moved out, it would be on a stretcher with a sheet over my face. He has never let me forget this, so I now can only remodel, rather than starting over elsewhere.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007