Insightful Reflex is awesome, as soon as you can take that, after getting firewall, do it.
I have one Wiz/Rg that I took very high before I remembered to take IR, and...let me tell you, I never will again. Huge difference.
There are a group of folks that never take more than 1/rogue btw. Every style has it's benefits/advantages/downside.
muffinarcane