216 was stable, but from my experience from using 216 compared to 247, 247 has been far kinder to me, and therefore, i recommend going to 247.
however, i regret to say that i dont know what will happen from going to 167 to 216 or 247 because ive done each incrimintal update. Worse comes to worse, dont update, but do a hard wipe and install found here:
BlackBerry 101: How to Reload the Operating System on a Nuked BlackBerry | CrackBerry.com
ignore the nuked blackberry part thing, its the same steps to do a hard install.