Usually I just try to get friends to join the raid first to see what spots I have left to fill, then I go to trade. Linking thori'dal in my trade advertisement helps attract people. I usually only take a few 70's(ones that I know) and if other 70's want to join I usually request they have a lvl...
Here's an easy way for Deepz to understand what everyone else on the forums is thinking. Its like when you're a kid, there is THE santa, and then there is aton of mall santas. Deepz is essentially a mall Santa
this ^
Although the bracket is completely flooded w/ mages (which may be an understatement), you'll still enjoy it. Go ahead and try it out along w/ all 3 specs, you'll lol at how quickly you kill other players.