I'd say I have to agree with Iggy, pliss, and Ruined. I think if you can get an HD DVD player for a really good price (like plissken's A2

) go for it! And like Iggy said, it also makes one hell of a great up-converting DVD player. And if you can score some HD DVD titles you want for a good price, I'd say do it as a lot of titles will most likely not be available on Blu-ray for some time.
Seth