I would suggest doing some research on the results of these modifications (intake, header, exhaust, and similar bolt ons).
The hp gain is typically minimal. Not worth the cash in a lot of people's eyes.
The civic was made to be an economy car. A reliable and fuel efficient commuter. If you want real power then your only real options are to swap for a larger motor, or turbo your current motor.
These "chips" you're referring to are gimmicks that offer no real benefits.
So to answer you're question.. A suggestion other than turbo, would be a motor swap. You can build your current motor NA (naturally aspirated) but again, the gains will not be very significant and you will spend a good deal of cash, and at that point, you may as well swap or boost.