I went just an AirRaid CAI, Throttle response and pickup in higher rpms are noticeable. The Tuner will yield the same max hp gains, BUT you get power throughout the powerband. Plus any other additional mods can be more effective with the tuner in the future. The CAI does sound nice though!
Not all CAIs will be the same, buy an ebay knock off and see what you get. I spent around $250 for my CAI, but the fitment is great and it looks great. Theres more that goes into a CAI then just a tube and air filter.