[eluser]Tom Glover[/eluser]
Dreamweaver CS3 is a good bet for PHP and CI coding. as it includes some PHP functions into the design view, for example if you use the function include('page3') it will show you the page and how it looks in the including file. If you get what I mean.
Also you have available spry for Ajax and access to thousands of add-ons to speed up coding.
Wamp is also a Good Choice for Testing as it is the inclusive of PHP, Apache and MySQL. This saves you having to install and configure the three separately.

Hope this information helps you.
Remember when testing code, check it on multiple browsers!