If you are ready to buy right now, I would strongly recommend Toshiba HD-A1 (HD DVD player). The best picture quality at the lowest price.
Blu-ray (a competitor of HD DVD format) so far represented by one Samsung player, has less than impressive PQ at a twice higher price. So, at this point it's an easy choice. However, things may change within a few months: until the format war is over, there is a risk with either format.