JSEclipse question

I use JSEclipse to edit my scripts.  It's a far cry from the awesomeness of Visual Studio and I'm wondering if there is a better editor out there that has the following:
[LIST=1]
[*]intellisense-like auto complete and suggestions
[*]error checking - EG:  if I reference a variable that doesn't exist, it would be nice to know that before I update the script and run in NetSuite
[*]Subversion integration
[/LIST]

IF you use JSEclipse can you suggest any reasons why the code-completion isn't picking up classes from other files within the same project?  I have a class in my "library" script (which is getting huge, I wish NetSuite would allow multiple library scripts) with various methods and properties.  When I instantiate that class in another files and press CTRL + Space I'm not seeing the methods and properties. I've checked the help and am not finding the solution to my problem.