It's a really hard one to do a quick valuation for... so this is really to be taken lightly... but here's what I think...
Namepros sale - $97
Auction sale - $650
Investor sale - $2,400
End User sale - $5,500
Unicorn sale* - $11,000
*Unicorn sales only happen one in a hundred thousand times, but they are possible.
Note: All figures assume that you do your marketing and negotiation optimally, and there is also luck involved of course.