Glyph of Arcane Missiles is generally used for Arcane mages intending to raid, along with your choice of Armor (glyph for either Mage or Molten, whichever you plan to use), and Arcane Blast.
They did a decent job at leveling out what's available. Mana Gem isn't a bad idea - just expect not to find the best results from this in most circumstances. Arcane Power is nice as well, but again remember for most mages it wont be the best bet. Where Glyph of Evocation is one of the best Glyphs for a leveling, soloing, or pvping mage - it really has no place with a Raiding Mage.
Remember, the most important thing is that you gear up with a plan. As long as the plan isn't completely loopy, and you understand the basic principals of the Arcane Mage, you can gear up in multiple different ways and get good results all around.
Edited, Apr 5th 2009 2:55am by tzsjynx