If you're looking to hook up all those components with surround sound, the sony system is not the right system to purchase. It only has one optical input and one coaxial input. You would need a system with at least three digital optical inputs. The following is a run-down of what you would need for each component:
Xbox 360 : Component connectors(included)and a digital optical audio cable(for surround sound)
Ps2: component connectors(purchased separately)and a digital optical audio cable(again, for surround sound)
HD Cable Box: you can choose between component video cables and HDMI cables [although older models might have dvi conectors]. Since the sony system only has HDMI OUT, you will need to use a digital optical cable to get surround sound--regardless of which Video Cable you choose(HDMI or Component Video).
Now, if you still decide on the sony system(you'll eliminate the surround-sound possibilities on two of your three components), you will definitely want to purcahse an HDMI cable to go from the system's HDMI output to your TV's HDMI input. If you want surround from the Xbox360, PS2 AND HD Cable box, you will want a system that comes with three digital optical inputs.
I strongly suggest the Onkyo HT-S790; I can tell you--as an owner of that system myself--that it is powerful; almost as powerful as the tower speaker system i have in the living room. its just a suggestion...research around for a system, but the sonyhdx 500 is not the one for you if you want all three of your devices connected.
by the way, the link to CNET's review of the Onkyo system i mentioned above is right here:
Hope this was of some help
Hey im looking to purchase a new tv and htib
ive decided on the vizio 32" lcd hdtv
but for the htib ive been looking at the aony BRAVIA hdx500
im looking to hook up my XBOX 360, hd cable box, dvd player(included in the hdx500), and ps2.
i could use some help with how i would hook all that up with surround sound, and what cables i would need.