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Well, if you don't "trust" the people who can tell the difference, how would you trust the people "who can't give a good opinion".
As you said, the only way to really test a sound system is to listen to it for at least 30 minutes. Why? Because in low end systems with mid quality and low RMS, the distortion can "hide" when you first listen to it, but after 30 minutes or an hour of listening to music you eventually get "tired" of it.
The typical example of this can be seen when a customer test drives a car and turns on the stereo just to "make sure it's nice". After 30 seconds of listening to it, they usually get satisfied with it.After one month with the car they regret not choosing the upgraded sound.
If you can't trust other people's opinion (which is a valid argument) and you can't test the system for long, you should just buy the premium system. You may regret it afterwards. You also have to consider that we are talking about a 70k car, so I'm guessing that another 1900+tax won't hurt.
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