There's no blurry text problem -- Mac has a "respect the font design" look, Windows has a "crude text" problem, and Linux is somewhere in between.
That said, a retina display totally changes everything. No "blurry" and no-crude. Just as reading a finely printed book. You wont want to go back to a low DPI monitor after a week of using a retina.
As for using Ubuntu for development inside OS X, that's actually the best of both worlds. You have a stable desktop system, and you can have arbitrary development environments for every job (assuming you use a VM), that are just like the target environment (assuming you deploy on Linux).
I'd also suggest trying Vagrant, if you don't use it already.
That said, a retina display totally changes everything. No "blurry" and no-crude. Just as reading a finely printed book. You wont want to go back to a low DPI monitor after a week of using a retina.
As for using Ubuntu for development inside OS X, that's actually the best of both worlds. You have a stable desktop system, and you can have arbitrary development environments for every job (assuming you use a VM), that are just like the target environment (assuming you deploy on Linux).
I'd also suggest trying Vagrant, if you don't use it already.