Don't bother... Minify is useful for CMS systems that have conditional inclusion of multiple CSS files, and are used by people who have no clue about CSS yet alone CDNs or any other TLA... But if your working with a single site, or even a series of sites, it's not worth it. It's easy enough to do without...
You could do one of two things. Either religiously update a compressed version of all the CSS files each time you update your production site, or write a build script to do that for you (you can call it on pre-commit if you want)...
Besides, if you have the traffic levels where you need a CDN, you don't want the overhead of loading PHP for every single css or js request (even if it is just pulling from cache). Do it either manually, or programmaticly in a build script and be done with it...