what is your mobo?
If you remove the JmicronATA you won't be able to boot if your disk is Pata and so connected to the Jmicron IDE.
This kext is for the sata handled by the IChx controller. And yes remove AppleVIaAta. this last one is obsolete.
see my sig for mobo, etc. My main drive is on the ichx controller. The system simply won't boot if I remove appleViaAta. I'll give this another go, hopefully it will allow me to use my 8gb. so far the only thing that prevents the random kernel panics under load is maxmem=2048.