The 240 doesn't have hdmi 1.4. On the PS3 the HD audio is blocked while playing 3D blu ray due to the HDMI being only 1.3, so the 240 only having HDMI 1.3 is also limited.
I'm interested to know if the more expensive cards that only have HDMI 1.3 can play 3D Blu Ray and HD audio. Maybe they can with less than full 1080p resolution but not with 1080p 3D.
ATI hasn't made the patch available for the 4550 to be used for 3D Blu Ray yet.
They say in different articles it may be able to do 3D but no word yet if it can.
So you need a Nvidia or Intel solution for now, or the PS3 or stand alone.
It may be better to wait for HDMI 1.4 video cards so you can play full 1080p 3D and have HD audio.
There is new, and then you are new.
This is a moral of the bears and their cereal.