The 13 inch model only supports 30 Hz and only offers full resolution (too small to work with) or 1:2 HiDPI (everything is gigantic, just like you'd expect from 1920 px on 32 inches). You can not even run it with native 1920 px to get the 60 Hz and a non-blurry image. 60 Hz do work with 2560 px though -- but then the display does the 3:2 pixel mapping, resulting in a very blurry image that isn't fun to work with. So my shot answer would be: Don't!
The 15 inch model might support 60 Hz, but the issues resulting from the very limited scaling options might still apply. There might be workarounds though: http://www.tonymacx86.com/threads/adding-using-hidpi-custom-resolutions.133254/