Stick with what you enjoy. I love Lincolns. I also have a perspective. I have the good fortune of working with a reputable rare coin dealer. He has a lot coins. He has shown me coins that demonstrate what is a 65, 66, 67...in Morgans, Nickels, Cents, etc. This has helped my roll hunting. You can get good if you see coins of a grade you want in person. Important thing when I send coins is a great light source (I use a 100W incandescent bulb), a 7x to 10X loupe--my current favorite is a german one--its expensive as hell, but it has saved me from buying coins with blemishes. Then I take a photo with my I phone, nicks you may have missed will show up. See them and you know the coin is 66 tops--the room for nicks, poor strikes, and white spots to be forgiven is small. If you have the money, buy UNC rolls from a reputable seller.