I'm in the same boat. I'd love something like Textmaker on my 770, and, like you, I've tried most of what's available and found them wanting. The internal notes app seems pretty good, but writes really nasty HTML that requires a bunch of fixing to get it to look pretty. Abiword crashes waaaaay too often to be trusted.

Maemopad's note/file structure is much too complicated for me. Basically, all I want to do is save RTFs to my memory card.

I finally just settled on Leafpad for plain text files.