You will be fine with the new ICS kernels from source they are all safe.
I don't want to confuse you but just to be clear, this means the stock based TouchWiz ICS (like this one) and does not apply to CM or AOKP or AOSP type roms.
Ok...I assume AGAT's 0.4.4 is fine then as well to revert back to my NAND backup from? That's what I'm currently running.