Originally Posted by FCW
What options do I have for flashing back to stock?
I do everything from a (2~3 year old) MacBook Pro. (Only use Windows in VM for extracting the rom.zip from RUUs.)
Personally I've never been in the situation where only a RUU would fix it. As long as you have fastboot and an unlocked bootloader, you're fine. I also recommend getting S-Off, so you can flash radio and wifi images.
If you ever want to get back to complete stock, maybe to sell the device, you can just wipe everything, then recovery-flash all images extracted from a RUU, including system, then fastboot-flash the stock recovery, re-lock, S-On.