I have a working JMicron SD Card Reader (J38X) in Mavericks 10.9. I used these three kexts (attached here).
I had to use all three, the card reader works perfectly. My specs are in my signature, but this is for a Toshiba Satellite P755.
It was a pretty straight forward process, used Kext Wizard, repaired permissions/cache/reboot. Card reader works and doesn't have to be plugged in on boot, works/ejects/ properly. Hope this helps others.