I think that 1varangian's point is that Wizards of the Coast should not have given EK evocation as one of its two schools, given that it was unlikely to be very good at offensive spell casting. Two buff schools would be better... I think that this is something I agree with.

That being said, I do not think that it is a problem to design a fun build around knowledge of magical items for a second run through. With the circlet an EK will be "decent" but not (I think) OP.