Nice domain name.
Even if all the others extensions are available.
I don't really know what to say here.

The plural is not really a problem, as a lot of people have several needs (above all when they are free :D)

Do you intend to devellop it?
I am sure there are a lot of ways to brand it.

Anyway, as it, undevelloped and without any traffic: i would say between 20-40$.

Good luck.