Adobe dreamweaver CS3 is no longer available from Adobe as they now sell CS5 which is $400 ($399 to be exact) but if your doing just a basic website then there is no need for Adobe Dreamweaver really but some people prefer it because of the features it has. It does come in handy for professional looking websites such as Geeks To Go for example.
Adobe CS5 can be found here
NVU and webplus are a good start to the website making world and will give you a good idea. Namo Web Editor is also good choice if you prefer something with a little more features. So in short term if your building a simple website and want it to look good I would choose Web Plus, NVU and Namo Web Editor or if your building a professional looking website then go for Adobe Dreamweaver.