Wow, BassBomb, just stop
I sent a PM earlier in reply to your question, itzhobbes:
"What sources are you using with it?
Internal tuner?
Hooked up to a cable box?
DVD player?
Something else?
The vast majority of computer speakers only allow for analog audio connections. Looks like that tv lacks analog audio output, so you may have very limited options.
What's your budget for this?"
I want to say a few things before you get ahead of yourself.
Your z-640s have analog inputs only. There is no way to hook up to your TV with those without buying something expensive to put between the TV and the speakers.
The z-2300s do not have a digital input.
I believe the only surround sound sets that could do a connection to your TV (and PS3) and get surround sound are the z-5500s and the crappier z-5450s.
itzhobbes, it's often the case that the digital audio output on your TV will only send audio out from the internal tuner.
My first reaction is that one of the cheapest ways to get this going is to get the z-5500 set (and possibly an adapter or two depending on all the sources you want to hook up).
If you have the budget for it, a medium range HTIB setup from Onkyo or another decent option will allow you to connect your sources easily and effectively.