Select font when converting .txt to .pdf from command line

I often need to convert text files to PDF from the command line. I currently use enscript, a2pdf, cupsfilter, etc. The feature I'm missing is the ability to use an OS X font instead of one of the "standard Unix" fonts. I'm particularly interested in the AmericanTypewriter font. Is there an existing tool to do that or perhaps an Apple Script? If not, are there any other ideas?