when you open your hood, look at the motor, if it has the VTEC name on the motor, you hava gs-r.
Gs is just basically having every option (suspension, rims etc . ) being the same as the GS-R but not having the GS_R motor.
LS is has a few options less than the Gs. It soes not have the stock rims, suspension is the same as the RS, stupid crap like that.
Rs is just the base model integra, no sun roof etc . ..
hope this helps