I recommend Eclipse with the EPIC plugin. It served me well on Windows (several flavors), Linux Redhat and more recently on my Mac. You can use it with Strawberry, Activestate etc. I use Eclipse also for other languages. The nice part is that are many plugins to integrate with other tools e.g. Subversion, Maven, Jira, Hudson to name just a few. See here for all the stuff that is available. So one integrated environment instead of having to glue the bits and pieces together.

But let me also mention some of the possible disadvantages:

• It's written in Java, if you are allergic it's a no-go.
• It's a big beast, i.e. not the fastest IDE in the world (some would say a resosurce hog;)

For me the advantages by far out-weight the disadvantages.

Cheers

Harry