The 6mo-1yr home warranty does appeal to lots of buyers but having bought a new home and taken advantage of the warranty fixes I would give it a 500$ value.
If something major is wrong with your home it should be noticed in an independent comprehensive inspection (highly recommended even on new building) . The builders tend to fight you on anything that would require major money to fix.
I would much rather but a 10 year old house that has had time to settle show how well it has held up.
