The only reason I have blu ray is because of my ps3 but if not I would buy Hd dvd.. Hd dvd has a much more feature rich menu and way cheaper cost in hardware with better promotions... The benifits of blu ray are better security which only helps the studio's and more room in the disc for whatever they please.
I hate format wars and sony always seems to be involved in them but they make good products it's sad they don't think about consumers Toshiba tried to work with them even holding back their release but sony did not and given their past failures at beta, md, and sacd.Those formats failed at there thoughts that these medians would replace their supposed replacements. (Beta vs vcr, Md vs Dat Vs Tape, Sacd vs Hdcd vs Cd). At the end I just hope someone comes out with something to stomp on them both or it's one or the other.
BTW Microsoft is supossedly set to release the Xbox360 Ultimate with built in Hd dvd, a massive Hard drive, and a Browser to name a few updates.