I use Elements despite the CRLF and BOM problems because its Dropbox syncing is excellent, it has a Markdown preview button, and it includes a nice monospaced font, Vera Sans Mono. You can see everything I like and dislike about Elements (and why monospaced fonts are important to me) in these posts:

http://www.leancrew.com/all-this/tag/elements/

One of the posts also describes a simple script that removes the BOM and turns the CRLFs into LFs.

If I had an iPad, I'd also look into iA Writer. Because it's iPad-only, it's of no use to me, but it includes a few good monospaced fonts. The developer's ode to distraction-free writing (http://xrl.us/bied7x) was silly, and was rightly mocked by Merlin Mann (http://xrl.us/bhz5cc), but the app itself looked interesting to me.

The last time I looked (http://xrl.us/bh7qty), Nebulous Notes didn't actually sync with Dropbox, it modified the files on the Dropbox server directly, with no local copy. This is a disaster if you need access to your files when you can't get a network connection.

Finally, there's the original syncing notes app, Simplenote. I stopped using it because it only allows Helvetica, making it nearly impossible to align columns, and it uses its own syncing system instead of Dropbox. But Simplenote has, far and away, the best search feature of any of the notes apps I've looked at. Still not incremental, though.