Thanks, but I've tried lots of more detailed ways of tracking before and decided this is just the one I prefer. My main concern is that I'm not overspending too badly and saving a good percentage for investments, and for that all I really need is a target spending number.
(Hopefully that won't be considered as self-promotion, but if it does. Admin/Moderator: just message me so I can change the message, so it's not considered as self-promotion.)