IMHO Emacs + different moduls, but this needs some customizing.

The best out-of-the-box solution I saw so far (for "Generation Mouse") is Komodo IDE but it's not free and for my taste it's too slow and has some python related quirks.

Have to say the most of the features you listed are only roughly possible in Perl.

UPDATE: ah I just saw that ECB will come in bundle with the newest GnuEmacs releases, have a look at the screenshots if that's something you're looking for.

For a first emacs experience I recommend Xemacs which has a much more mainstream UI than GnuEmacs.

PS: And if your wondering why this post is getting downvoted, it has to do with the typical tolerance of other religious d(en)ominations in this monastery...