Namejet only auctions non-premium domains. While I suppose there is some risk of repricing at a later date, that could be minimized by transferring the domain to another registrar after 60 days. Note that one can lose a domain won in Namejet auctions in some cases. I lost a Spanish .TV domain I had backordered at Namejet probably because I mentioned it one of the forums and someone said, "oops" and reclaimed it. So if you get your hands on a good name stay quiet for a month. I haven't seen any meaningful number of .TV domains at Snapnames so I believe the primary options are Namejet, Enom and TDNam.