I have a decent set of 4.1 Cambridge speakers that I used with my PC. But now I have the Mac Pro. I could not be any happier with the system, except, I have not figured out how to get the most out of my system when it comes to sound. A friend of mine gave me a Creative Extigy USB set up. But I can not find a driver worth its weight to get it to work on the Mac OS X. I think I am going to sell it on ebay. So what are some of my options when it comes to sound output with the Mac Pro? I don't want to spend a ton of money. Do I need to buy a new "sound card"? Is there some type of USB system like the Extigy that works with a Mac? Do I just need to buy a new set of speakers?
Well, thank you all for your thoughts in advance.

-C. Allen
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