30k is probably the sweet spot for a high performance system if is well balanced and only has 1 or 2 sources. An excellent digital front end (analogue of comparable quality would likely drive the price upwards) a good integrated amp and speakers setup in an appropriately sized and treated room should offer all one could reasonably ask for in sound reproduction.
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I just got it yesterday and they are reviewing amps from 12k to 97k. I sat back and thought who is really buying this stuff. I know the average audiophile Isn't and the one's that actual have the money are always looking for deals via Audiogon. Is this just audio porn for the readers or are people actually buying this stuff.