If you're not quite brave enough for nightly builds, but aren't content to wait around for stable ones, CyanogenMod's M builds might be just right. Today you can grab the latest M3 build of CyanogenMod 11 (KitKat) straight from the source. It isn't available on every device quite yet, but it's only a matter of time.
The M builds are "snapshots" of the ROM that are released about every month. There are fewer bugs than nightlies, but the polish from a release candidate or stable build might not be there.