Frankly, I don't see a need to pay more than $500 for a lightbar. Maybe $1000 if you need two colors available, need both to provide 360 degree visibility, and can't use both at the same time, but an MX7000 with prudent and use of additional lighting would do fine in that case.
I can see how various features of more expensive lightbars would be appealing, but most of them - low power draw, for example, or various scene lighting options - are more of a want than a need. My own car is getting old, but it's still got a 135-amp alternator, and it's just a boring volume-selling midsize sedan, not a truck, let alone an emergency vehicle. And yes, the jog feature of a Vision is a great thing, but a Unity spotlight is much less expensive, and has the added benefit of vertical adjustment as well as horizontal.
We'd all be paying less taxes if the LP6000 was in wider use.