NameInBox.com definitely is worth keeping, I see a site/service with that name, a product, even a co
Playmates.co I do like but I don't have much hope for the .co ext, things are just not happening for .co and it's been 5 yrs
(ditto for MusicShop.me, such a great domain... but lousy ext, possibilities are limited)
CargoHost.com I'm not sure what you meant by that term ?
and KIOA.net is a great pronounceable, both brandable name and acronym but it's too early for LLLL.net's with so many LLLL.com's still around
(KIOA.com is owned by that radio station, did you contact them ?)