According to the-magicbox.com

- Microsoft announced the HD-DVD peripherial for Xbox 360, tentatively named Xbox 360 Player, will be sold for US$199.
So...

Xbox360 with 20gb HDD = 400
+
HD-DVD peripheral = 200
=
600 dlls

PS3 with 60GB HDD + Integrated Blu-ray reader = 600.


The only difference is that the xbox gives you the "choice" of not watching hd-movies.