Hi,
It's quite a good domain for marketing purposes. The .co ext'n is fairly credible, and has many high-priced sales to speak of. Furthermore, "turnkey websites" is a message that is both potent and unambigious.
As for value, I would say that you could get up to $500 or so from a buyer who intends to develop it out as a site that sells turnkey sites.
Good luck,