Need and external HD Capture card for Mac

[any ANONYMOUS forum user]

I'm looking for HD Mac compatible external Capture Card, but have no clue, feedback would be appreciated.

Blackmagic seems to be the only company offering reasonably priced HD Capture cards. The problem is that one of them uses PCI-Express and is compatible with Mac; while the other one supports USB 3.0, but is compatible with Windows only. See the following thread for more:
How to capture/record video from HDMI (record game play from XBox 360, PS3 to PC)

p.s I can suggest you an external card that is compatible with Mac OS, but it costs $450+ ...