Agreed. An Acer Chromebook would be a good choice if your're using it to web dev. But I would suggest you try Koding (http://koding.com) Mainly because it has a few notable features that are perfect for a Chromebook.

A Chrome app https://chrome.google.com/webstore/detail/terminal/kogcfmeen...

Free virtual machine (VM) with Ubuntu, root access, apt-get, and many commonly used tools

Built-in Terminal with 256-color support

All languages, databases, and command-line tools are supported

Various file upload options such as Drag & Drop, Dropbox, Clone from Github, FTP and the ability to access them using SSH

Real-time code and terminal collaboration with integrated chat abilities

Subdomains serve PHP, Perl, Python via Apache, and additional ports are available for other web apps

So in my opinion that's your best choice. :)