Thank you for your very well thought out reply @Bruce Lynn
That is a good point about buying near new rather than new and for my intended purpose it is basically the same. In that case I should probably look for near new so that I can get a gauge on the neighborhood first before committing. I know the kind of subdivisions you are talking about and I have also walked through houses like you mentioned. The ones that were bought new and basically never had any maintenance done on them in a decade or more.
I fully expect to replace the heater and HVAC on new construction, but I should get at least ten years care free I would hope. I also know what you mean about these builders putting in the cheapest hardware they can find. Dishwashers and water heaters particularly stand out from what I've seen of late. I always go for four brick walls. I do not want the added maintenance of exterior painting if I can avoid it.
I did not consider PEX. That is a good point. Especially after the last big winter storm we had here a few years ago.
I am a long term landlord. I have a few that I have held so far for 23 years. Given that I intend to hold on to my portfolio for at least that long again, then having something newer now, rather than older makes a big difference 30 years down the road, as you say.
P.s. It's funny you should mention Princeton. My wife put the kibosh on buying new construction in that area last year.