How to tune Notes on OS X to use plain text or not to reformat quotes? As technical guy, I do hate the markup support in Notes.app and I would prefer to be just a smart text one.

Here is my wishlist:  


Use a different font, like a fixed width one
Drop any font/color/size on text paste
Prevent replacing quotes with smart-quotes/curly-quotes (I like this while typing an email but not here where I copy/paste even code!)


I suspect that some of these could be obtained using some hidden preferences options. Anyway, if you know other 3rd party applications that could replace Notes, let me know. Still I do not want to lose the ability to access notes from iOS!
Notes

Notes.app in OS X 10.10 can do all you request:


Font colour, size, and family can be set through the Format menu.
Substitutions and smart quote behaviour are managed through the Edit > Substitutions sub-menu.




Beyond Notes: Text Wrangler

If you need more than Notes.app offers, try Text Wrangler from Bare Bones.