now if you're REALLY looking for the best quality, sometimes old Acid compilation CDs are ****ing treasure troves of unmixed tunes. think of it this way - you're ripping your own vinyl, which may be 15 years old (or more) and has been played many times. when these old CDs (ie Sound of Acid Core - http://www.discogs.com/release/145426) were made, the records or DATs they used for the CDs were of nearly perfect quality. so they were basically set in stone, and never degraded. many of the tracks i've found this way sound much better than the vinyl releases due to lack of wear, direct lineage, not being affected by the vinyl's master/cut/surface noise, etc.. well worth having these CDs now that were in the digital age.