I have heavily used Dreamweaver, CFeclipse with eclipse and now Coldfusion Builder. What I found is this:
1) Dreamweaver is only good for the few times you have to do some wysiwyg wizardry. The newer versions do have SVN integration so you might be able to get away with using it. I did use it for a few years on windows.
2) CFEclipse + Eclipse - Generally the standard of what' sbeen used for a while. Runs well, once you add in the Adobe dictionary files and subclipse, you have a good environment
3) Coldfusion Builder - This is Adobe's version of CFeclipse. It's still pretty new and getting to later beta. I switched to it about 6 months ago and haven't looked back. It's got a lot of wizards, including the ability to write your own plugins in CFML that will run right inside CFbuilder. It's free right now on beta but will likely be pretty cheap like the first flex builder that came out.
My Choice: Coldfusion Builder. It doesn't mean the others aren't capable, but you'll spend the least amoutn of time getting setup and maintaining your plugins, etc.
Since I had paid for and used Dreamweaver for a lot of years (Eclipse was generally sluggish sometimes on PCs' a while back until the excess of ram + cpu today), spending to have an adobe maintained copy of eclipse is okay with me. The wizards available in CFbuilder, especially for flex are excellent.
Hope that helps, good luck and share what you ended up picking and why!
