I guess I'm in that second category too. I usually just plan for expenditures and that's about as far as I go in the budget area.
If I had a lot more business, it would be worth drawing up a budget for the year, and see how well I could stick with it. I think though, that you'd need some starting capital to really make that work, so you could plan your purchases to take advantage of the right timing, instead of when you've finally saved enough through the year
