I, too, like NWP 2, and join threestain in his recommendation. Even the upgrade price, well, I paid for the last upgrade in 2007, so that means this one is $49 or $5/year price. (Yes, I know, the price goes forward, but you get the idea.)
I have been using Nisus Writer (System 6-9 from 1991-2003) and Nisus Writer Pro (OS X since 2003). It is a competent, powerful program that is also easy to use. Is it perfect? No. But I use it regularly with Mellel (especially for Hebrew projects) and between them they meet all my needs.