new doors all around house.

Depends what you are trying to achieve. Cheap egg box doors will fill the gap and keep the draft out, but look pretty lame.

Slightly posher egg box ones come in various styles of "panel" layout. Look a bit better. Still not much copy for a quality feel or for reducing sound transmission.

Real softwood for something to be painted that will look authentic and do a better job of keeping sound transmission down.

Engineered wood are quite a good all round option. Real hardwood faces, but stuck onto a MDF or similar mad made core. Hence dimensionally stable, and unlikely to warp or crack. Much better noise isolation.

Real hardwood if you want to spend the money.

Mid priced fire doors can be quite a cost effective way of getting a dense heavy door.

Thanks, that's the sorta info I needed, I now understand the differences= .

second hand ones.

Just one other thing to add: knotty pine has more risk of warp than clear.

Sounds like a good short wiki article.=20

NT

all of which (unless plain) will be of a subtly different design & shape - none of which will look like they were supposed to be together

Jim K