This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
GUI IDES are one and all of them pigs. Even back when I was using Visual Café, it needed something like 600MB and the actual memory requirements were roughly the same, including for Forte, which is NetBeans great-grandaddy.
So I wouldn't base my IDE choice on memory footprint.
Customer surveys are for companies who didn't pay proper attention to begin with.