Unpopular Or Relatively Unlisted Overdate Varieties Of US Large Cents?

I am a low budget collector, just trying to build a decent set of circulated coins. I am not in a position financially to purchase every variety of Large Cent ever minted, so I have limited myself to following the Red Book and adding a few extra varieties along the way. I particularly have an interest in overdate coins. I call these transition pieces as they often bridge the gap between two different years. For example, I purchased a very low grade 1798/7 to bridge the dates 1797 and 1798. This was a no brainer because it was described in the Red Book. However, I discovered that there are other relatively unknown overdates out there worth collecting. For example 1849 N-8, which is the 9 over 8 variety. What I wanted to know is if anyone could give me a list of some other overdates that might not be listed in the Red Book. I just happened to run across this one by accident, and was wondering how many more exist. Thanks.