Ask HN: Help me find the right font

I'm a web developer with a severe visual impairment. I'm legally blind. Until recently, I've been using a fairly standard (9pt) font size in my editor, because I liked having all of that space when writing code. However, it forced me to sit rather hunched over and close to the monitor in order to see it, which has started causing neck problems.

A simple solution is to bump up the font size (I already work on a 24in monitor). I can get used to not having as much real-estate to work with, but now I can't find a good monospaced font that looks decent at larger sizes (say, around 14pt). Everything I've tried either looks pixelated, which I find very distracting, or is still too thin to really be that much more legible to me.

I need a medium-weight, monospaced font that won't look terribly pixelated and jagged at larger sizes. Does such a font exist? Any suggestions?

Thanks!