Best bang for the buck and greatest ease of installation remains a set of smooth tubes (e.g., Cobb) and K&N panel filters (details in the Proven Power Dyno Thread)
Or, if you can find a set of G3's or a similar design for around $300, go with those, as you'll probably pick up 6-8 more whp.
I wouldn't ever run any intakes that have the filters by the wheels, as the AEM one does, especially if you live in an area prone to flooding.
I also have a (presently stalled) intake project underway with Swift Racing that will utilize CNC'd bell mouths to improve flow, but no idea when those will be made.