i did a thing about this just the other week

basicly the hd looks like th ebetter bet because all the games consoles will suport it, and it's a 1/3 of the price of the blue ray stuff which is blue ray player only

the same film viewable on the normal dvd as well as hd dvd isn't striclty true, as they will put the normal film on one side and the hd version on the other side, this won't be much more expensive thoug, but you are looking at a lot of money to by a dedicated blue ray machine whereas just about everyone else wil be putting out hd compatiable players onto the market