Retina Macbook Pro. You can run it at a variety of resolutions that all look very sharp - 1920 x 1200 is very usable, but you can bump it way up to stupid high

Retina Macbook Pro. You can run it at a variety of resolutions that all look very sharp - 1920 x 1200 is very usable, but you can bump it way up to stupid high resolutions if you want screen space. I've found it's awesome because I can effectively go from web browsing on a 1440 x 900 laptop to working on the equivalent of an iMac (2560 x 1440) or even higher (2880 x 1800) without losing sharpness. If you then want extra space, you can plugin in an external monitor, but to be honest, I ended up selling the two externals I used to use (they were 1080p, and seemed small and blurry in comparison). Using OSX, you also get the benefits that it's very unixy/linuxy, so you get bash, ssh, openssl, grep, sed, ruby, python, php, apache etc as part of the system. With Xcode you get other tools like git. Configuring an acceptable dev environment for web dev can be done without downloading anything extra. (Of course, to get an awesome dev environment does require a bit more work, but arguably much less than the equivalent on Windows).