I'm pretty conservative when it comes to money. My parents were very working class and constantly working. There was always a very strong work ethic and that's put a more conservative, "save for a rainy day" mentality into me.
I used to prefer cash but I'm more and more drawn to cards because with certain cards you get the full lists which you can then pass on to your accountant so you don't have to do the whole receipt, receipt, receipt thing as it's all itemised.