Brembo replacement rotors stock size plus a good set of pads and new "hard" brake lines all the way to your caliper will be anough for you. Your car is not nowhere near fast enough to need a big brake kit and to tell the truth not many other civic's are either period.

 

www.sportcompactonly.com <that site has a lot of brake kits. My dad has 2 firebirds with C5 corvette brakes on them and those are 13"s .

 

im pretty sure the biggest rotor you could fit under 15's is about an 11. look at the FastBrakes place that riceburner posted.