If you re used to windows behaviors (e.g. ctrl-c is copy, etc.), a good (customized) version of emacs for windows is the EmacsW32 package.
If you re looking at migrating away from eclipse, I assume that you probably want java support. For this you will want to get the JDEE package, also. Unfortunately, it s non-trivial to deploy on windows, as it depends on other packages (and requires cygwin or msys (pseudo-unix environments for windows) in order to install).
You may also want to install additional modes to support e.g. SCM systems, etc. A good source of information for this is the EmacsWiki. There s a significant amount of material there about emacs on windows, although some of it is out of date....