I LOVED Coda, it was my first "real" editor (a step up from NP++) but now that I'm using IDEA I can't imagine going back to something with such a small market cap/plugin developer ecosystem. I wish Panic the best (and I still love them as a company) but I just don't see Coda/Nova being worth it (price or ecosystem-wise) just to have a beautiful editor. Maybe I'll try a trial when it comes out but it just looks... less powerful... that I really need from my editor.
All that said Panic is awesome and the breadth of what they do (Mac Apps, iOS App, Games, handheld gaming hardware) is crazy. I wish they would show Prompt some more love as I fear that is slowly being abandoned and I'll have to find an alternative SSH iOS client.