I had mine all on Sedo and switched to Afternic (also propagates to GoDaddy) after a few months. You can still keep listings on Sedo while pointed to different nameservers. I recommend using Afternic (often the most visibility comes from there), Dan.com, Sedo, and if you want GoDaddy Domain Auctions. I choose to point to Dan.com nameservers because I like their landing page, but you can actually list on Afternic now and choose to use the Dan.com landing page. Sedo is less visually appealing IMO, and I have not had a single sale or offer through it