get an overdrive pedal...distortion pedals end up sounding like solid state pieces of trash for the most part and if you're going to be getting a tube amplifier like the epiphone amps are, all you need is a good push from an overdrive pedal to get the good distortion.
....what sounds the same on your 15 watt amp? distortion pedal? probably so....
okay...my post is done...goodbye.