well, with my bad ears a 192kbps mp3 is usually ok - higher is better :). But, alot of the cd's that you can buy in store comes with a bunch of data-crap that gives you a flashplayer and other [censored], and by avoiding that 'protection', I am commiting a crime more or less according to swedish idiot laws. So, buying mp3's right off for me is usually the easiest way to go. I don't care about getting loss-less, don't own studio stuff that can handle all frequencies 'n stuff anyway.
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as long as it works - why fix it?
If it doesn't work - kix-it!