the lower the octane, the lower the fuel's flash point, which is the pressure and or temperature it takes to make the fuel ignite... so 87 octane gas ignites easier than 89 octane, and much easier than 93 or 94 octane. Once you add performane mods to your car, you almost always need to use at least 93 octane gas, to avoid detonation (the gas exploding in the cyllander before the spark plug fires, causing major stress on the internal components of the motor). For a stock SOHC, just look in the owner's manual to see what octane Honda reccomends for the car, and run that for the most part... although you may want to splurge occasionally for 93 or 94 octane gas, as it usually has more detergents and cleaning agents in it, to aid in removing carbon build-up inside of the engine. Since I dont know what the reccomendation from honda is, I would personally tell you to go with atleast 89 octane... and if possible, ask around to find out what gas stations are reliable... in my area, the good ones are Exxon and Chevron... because less reliable stations have a tendency to water down thier gasoline, which is bad for performance.
I know this all seems like quite a pain to go through, just for gasoline, but remember that choosing the right gas and the right oil are 2 of the biggest factors to maintain a well running, long living engine.