What Are The True Collectible Errors ?

I read hundreds of posts about possible errors on coins, some look major other hardly noticeable. What exactly are the truly rare, collectible, and valuable errors ?
Right now I have approximately 13,000 Lincoln cents that I have to go through, it seems like every other cent has some form of flaw. Frankly I look at the newer non copper pennies and to be honest even the freshly struck cents aren't very impressive to me as a long time collector of Lincoln Cents. What is even more disturbing is after a few years these new cents start to deteriorate and don't look good at all. So for the most part I ignore them.
So if you had to list the top 10 errors to look for, that may still be found in circulation what would they be.
Like I said earlier, if I kept every cent that had some form of flaw, of the 13,000, I would have probably 5,000 keepers.
I hope this is not too general of a question, if it is, then maybe some suggestions would help.
Thanks.

Dan