Tvad, the "copyright police" aren't going to believe anything you say, if past precedents hold true. They simply sue you based on some evidence of some kind, and then you are locked in litigation. The judge, theoretically, will weigh the facts and give you a fair hearing, but the RIAA won't. They will subpoena your hard drive and try to show that you have stuff that is pirated. You may be able to defend yourself on the basis of showing that you ripped stuff to your hard drive that matches your collection of CDs, that the creation date on your files matches your patterns of having ripped batches of your stuff. You may also be able to show that things are legal downloads by reference to your activity on, say, the iTunes Music Store. By then, however, you will have had to have hired a lawyer and probably burned tens of thousands in legal fees. And the judge may be a technical ninny with no understanding of your defense. This is why so many settle out of court with the RIAA, even if they didn't do anything wrong. This is also why the RIAA sucks.
I see a lot of statements here regarding what is legal and what is not. A lot of what has been categorically stated as legal or illegal is flatly wrong and based on GCEs. If you are interested in this as a matter of law, check this thread. It is exactly on point and it is the copyright blog of a lawyer who is formerly copyright counsel to the House of Representatives.
http://williampatry.blogspot.com/2005/10/first-sale-hard-copies-and-digital.html