I'd definitely get pokertracker or holdem manager. That said, excel sheets can still serve a good purpose. I know of players who keep records daily and include some things that PT has but also put in like money taken out and notes from each session. And then there are also other players who have a very detailed excel sheet (what I am working on) that kind of goes into how much money you expect per month and how much you can have as "leisure" money as well as other records.