WordPerfect 4.1 for Amiga is still my ideal wordprocessor. Nearly all the features of 5 for DOS, but running under my favourite OS.
I did some very complex documents with WP - it handles tables of contents, page formatting, indices, and most other things extremely well. The spell checker can be expanded with custom words.
But it's an old application with a few quirks. Here's one: I've found that running any MUI application concurrently or beforehand tends to screw up WP in a subtle way; be careful when saving documents. The usual requester doesn't appear, instead there's a dialog at the bottom of the window.
Amir