Lets face it you need Creative Suite if you are doing any sort of serious design work. While there is a lot of good open-source stand-alone products none live up to the complete package of CS.
However CS4 is damn expensive! Probably why a lot of people pirate the software for private use. When you run a business you cannot afford to run this risk and it is a bit rich stealing to make a buck.
Because of the cost I was excited when I went to buy CS4 to find out that there was a subscription edition. The details about? Adobe Creative Suite 4 Design Premium Subscription Edition are on the Adobe website.