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You will need a mini-TOSLINK to TOSLINK cable for optical audio. Any 5.1 system with TOSLINK input will work.
The system you linked to appears to have an optical-in port, so it should work.
 
I'm planning on getting the Bose Companion 3 speakers soon hopefully. I heard them at BestBuy and sound pretty nice. Dont really care for 5.1 sound since I dont watch movies on my Mac.
 
I'm planning on getting the Bose Companion 3 speakers soon hopefully. I heard them at BestBuy and sound pretty nice. Dont really care for 5.1 sound since I dont watch movies on my Mac.

Put your money elsewhere and get some nicer speakers for less money.
 
Thanks for the replies guys, forgot to add if anyone knows what type of sound card do the iMacs have? Is it just integrated on the chipset?
 
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