I'm on the waiting list for an f18. I really like Funnelwebs 80 column editor, I don't know if that will ever be ported.
The other editor I really like on a TI/Geneve was PrEditor by Tom Bentley.
Anyone here still friends with Tom? If you are, do you think you can get him to release the source to PrEditor, it's my understanding it was in part written in small C and might be easier to port then an editor written in pure assembly?