Remember that a perm job is usually worth about a third more than salary when you include benes.  Don't give up a good perm job for temp betting it will go perm.  Be prepared to keep working temp for a while.

On the other hand, if you want to leave the current job anyway, the money looks good.  I don't know what effect the junior/senior thing has.  The way I look at it, I'm still the same guy, with the same experiance, regardless of what I've been doing for the last six months.  In my field, we take the attitude, "you can call me hey you, or chief technical fellow, just make sure you call me for lunch!  It's all about the money.