How should this sound?

Well, if the amp is good, it doesn't matter if you run it to max load, but for cheaper amps, it may make a difference. As I said, with a brand like JL, it won't matter, because they have a high damping factor to begin with.

As for your component suggestions (and also what your sig says you have), I would have to say that I disagree with all of them. Nakamichi, Eclipse or Alpine deck. Focal, MB Quart, or A/D/S speakers. Adire subs. That would make a sweet system.

What kfr01 is referring to is the damping factor of the amp. Now I too have been installing for many many years and long before this class D and mono amp garbage came about. We had class AB amplifiers and some of them were monsters (Alpine 3545 for example). These amplifiers were only stable to 4 ohm mono, thus most of the subs of the era were svc 4 ohm and in some rare cases svc 8 ohm. Now with the plethora of class D amps on the market and their ability to produce gobs of power as the impedence drops, there has to be a tradeoff. This tradeoff comes in numerous forms.

(1) increased current draw

(2) increased heat output

(3) poorer damping factor

The latter part is what I will only touch the surface on. Each time that you drop the impedence by half, so drops the damping factor by half. Down to 1 ohm is far less than running at 4 ohms. The amps damping factor is the ability to control the motion of the driver, hence the sometimes used term, "sloppy bass". If you two amplifiers with the same subs and same box and do a side by side comparison on it, in your car, then you will truly understand the difference. To do a test like this you need a class AB amp (monster 2 channel that bridges to 4 ohm and provides say 1000w rms) and a class D 1 ohm that also produces 1000w rms. The second part of the test is the subs in the box, for the class D amp they need to be wired in a all parallel circuit to provide the 1 ohm to the amp, for the 2 channel change the wiring to a series / parallel circuit to present a 4 ohm load to the 2 channel amp. Listen away to your hearts content after that. Each way has it's advantages  / disadvantages, but in terms of control of the sub or "sloppy bass", the 2 channel Class AB will win every time.