If it is not that good domain, you can sell in Godaddy Auctions as it is the largest and most reached marketplace, followed by Sedo. But if it is quite a premium keyword domain, try directly selling on Sedo.
You can also try to sell it on NamePros "Top Domains" forum and save paying commission!
Rest marketplaces are good, but it takes years to sell domains there as the traffic is too low compared to sedo/godaddy