What the domain will be worth will really depend on the quality and type of backlinks and who you are trying to sell it to. Personally, I will comfortably pay $1k for a domain with 4 dofollow backlinks from sites like cnn.com. The anchor texts used in the backlinks will also have to be relevant.
On the other end of the spectrum, I will not pay reg fee for a domain with 200k spammy backlinks with adult, pharma or/and casino related anchor texts.