If it really is under $1000 it'll be a steal, the 24" doesn't have a price yet though, and the 32" is over $2500 I think.
If I was to get a 4k display it'll probably be the Dell as it's geared towards professionals, and won't have a nastily glossy screen.
A 32" would be prefect for me, as I like the screen real-estate but don't like multiple monitors or bezels breaking up my work space. It's just that price tag.
Two 28" at $2000 is still more space, and costs less than a single 32".
The 24" does have a price. It is $1499