Mustrum_Ridcully
Legend
I vote for Fwiz. Can also be turned into an adjective, as in "that class is a bit too fwizzish for me".
Sounds gishy to me...
On the whole topic, I feel reminded of this one: http://xkcd.com/14/
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Just substitute copyright law with gish.

It's not that I particularly like the term. But I just can't bring myself to dislike it either... I am not sure if it will ever be used in my gaming group. Fighter/Wizard and Swordmage/Mageblade/Duskblade will probably do for us.