What's in a [domain] name? Would a reddit by any other name smell as sweet?

Thinking solely of the impact of the domain name for a given company name, consider the following:

Suppose the company name for some hypothetical checkers afficiando site is "King Me". What are the relative merits of the following domain name choices?

kingme.com king-me.com king.me king.me.com kingme.net kingme.org

Presuming the venture has profit motives, is the choice of domain name at all relevant to the likelihood of business success?

Assuming one of those domain names were available in the primary market, and your first preference were domain-parked on sedo, what would you be willing to pay at sedo?