OP. I have the AEM, with invidia q300 TBE, and cobb OTS stage 2. the intake makes a cool sound, and with my other mods does increase power. (albeit not massively.)
if you're gonna get an intake, atleast get the Cobb AP and go stage 1+. you wont regret it.
as far as which intake, the AEM is similar to the cobb, but sits in the wheel well. comes with a block off to keep heat out, and is hundreds cheaper. something to consider.