As a man of methods and efficiency: date and mint collection by series.
In coins:
-My Peace collection is nearly complete save for some high quality keys.
-My MS/PF65+ Walker collection is in its early stages. It takes a few hundred dollars just to add each coin. This is a series I persue when the other series are slowed down.
-I recently began an interest in a better grade (but still affordable) Barber dime series as well as the same in V nicks.
-Completing as much of my whitman albums from circulation is a goal.
In notes:
-My $1 silver certificate has covered a lot of ground. The series involves: 1923-1957, all signatures, all letters (A,B,C,D...), all design modifications, all experimentals, all seals, all stars, and anything else you can find in the Black Book. The only notes of the 50+ note series I need are some very hard to find ones easily in the $500+ range in an acceptable condition. Silver certificates mean a lot to me because I was with my father when he found one in change a couple years back, he told me what they were, and I thought of them as an exciting, affordable series with its own challenging notes to persue. I will add to this collection by going to earlier years and other denominations. Mark my words, by the time I am 30, I hope to have one of the nicest and most complete silver certificate collections ever. It's possible.
-I will start another series of US notes once I figure out which is worth my time and money (both very valuable and scarce to me). Any suggestions?
Thats about it. Nothing too exciting. You asked, so I told.