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It really depends on what you'll be using it for. For basic disc burning, use Burn.
 
burn is free, so just use it and if you find that it is missing features that you could use, then go and buy toast because it will probably have those missing features.
 
I use SimplyBurns which is Free, just google it. Has a decent interface and is real easy to use.
 
I use both Toast Titanium and Burn.


Titanium is used for more then just a fast cd/dvd burn. I use Titanium for more professional disk burning.
 
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