Car stereo guru needed.....

I know in Pro Audio that you always select an amp that`s 1.5- 2 times the speakers continuous power rating so that peak transients created by the amp will be undistorted, thus saving your speakers. Amplifiers with plenty of headroom will apply only clean ,undistorted sound to the speakers. In studios, amps are often selected that are up to 4 times the speakers power. I understand the importance of getting a clean signal to the speakers and how much more power is required to move low frequency waves versus high frequency waves. The speakers I have are rated at 80 watts with peaks at 120 and are fairly inefficient with a 89 db spl. From what I`ve read they are power hungry and will pump heavy bass out of a 6 x 9 but require an amplifier in the 100 watt range to really make them sound good. I already have filters installed in my 5.25`s to prevent the low end from destroying them. I`ve been looking at Alpine amplifiers, any comments good or bad on them?