looking to install air filter/induction kit on stock astra H 1.8 sri...... someone recommended k&n appollo, any thoughts????????

hi am new to this , 2nd car only and have an Astra H 1.8 sri.... I am planning on doing a few bits and bobs to the car but not OTT as i am waiting for my insurance to drop again before i invest in a vxr...... Sound system and tints will be done within the next month but think i need to do...