HP gains from intakes are normally small even compared between different types. Techincally the CAI should provide more of a gain, however a SRI can give just as close.
The biggest gain you will get is throttle response/rpm, not really HP gains.
Injen makes a decent CAI that alot of people here seem to use with good results.
While others use the SRI ebays since they are only about $40 (US).