Wouldn't a WF have the same problem with rust monsters? (I dont know, since i dont own WF, but in groups the seem to be deathly afeared of rusties)
@topic, like I said, I dont own wf, but i have a lvl 20 pm wizard and love it :P. If you are mainly soloing, searing light isnt as large of a pain as it is if you do full groups due to dungeon scaling. WF is a good race for a wiz, even if you do go pm, since it means you dont always need to be in an undead shroud, and you can test both AM and PM more or less freely, so I would make a warforged and try both out.