If you plan to resell in the near future, you may get it for reg fee. The domain is worthless on its own; must have content attached to it, but even then, it wouldn't be too valuable.
modernwar.info
If this is to be potentially first filled with a lot of information about modernwar, and the presence of the domain get's known. Then you sell it, I'd say this is probably worth A LOT to a fanatic.
Maybe $500?
Not sure though, not a professional. Good luck with it though Patrick.
I'm not a fan of .info's either, aren't they super cheap?
I'm a .com guy as well and "maybe" the .org if I want to secure it as well.
I'd say the 500$ estimate would be after years of building the site and rank, I'd say it won't come easy.