I discovered Inconsolata two years ago or so, and it's been my go-to monospaced font ever since. I have it set to 11 points anti-aliased and it just looks gorgeous!
For your viewing pleasure, here is what my typical development environment looks like (anti-aliased retina 11pt Inconsolata):
http://akhun.com/seo/skitch/Screen_Shot_2012-07-19_at_10.17....