It's really a good idea to keep the nicest coin of each date and mintmark. Not that these will ever necessarily become valuable but it will help you identify the scarcities to know what they are supposed to look like. You'll also learn much more about coins and circulation. The cost of this is very nominal (the cent book will cost more than the cents and the quarter set will cost less than $20 with the book).
Circulating coinage is far richer than in the past simply because so few people are looking at it. This won't last forever because they are starting to.
Time don't fly, it bounds and leaps.