I am rather new to the car audio thing, cars as a whole actually.. Currently i am running Quinn Accoustics QE693 6x9 3-way (30W power, 90W max) on front doors,an Alpine S-S65C component 6-1/2 2-way speaker set (80W rms, 240W peak) on back doors, a Kenwood Excelon KFC-X2C 2-3/4th inch speaker set (50W rms, 120W peak) in the dash and dual electronics TBX10A 10 inch sub (built in amp) and no amplifier. All i know is i was told i should get a 5 channel amp by the guy at the audio shop. My vehicle is a 2007 Nissan Titan XE Crew Cab and has mounts for 3.5 inch speakers in the dash, 6x9 speakers in the front doors, and 6.5 speakers in the back doors and i am looking for a good speaker system to use for Country, Rock, and lots of Progressive Metal, but am on sort of a budget and cannot afford to spend thousands on this, I would like to get speaker/amp/sub suggestions, Thank you in advance for your time.