You should be able to sell Easttimor and marshallislands for low to mid $$$
I have seen similar .biz sell for at least that much acrodd different places.
If you hold on to them, you might even get more in the future.
There is nothing wrong with .biz, and it fits with country names quiet well.
sri-lanka is ok, the hyphen hurts it. Hyphens IMO are ok only for .com (for type ins), or in extraodrinary circmstances were there are 3 repeating characters in the word.
i.e.
staff-force as opposed to staffforce (example)