To the op, Read this article for a better understanding on DB and rms/watt power.
Theoretically 90% of the time you listen to your sound system at 1 watt. (It is hard to grasp this concept). The only time your 850 watt amp will have a full effect is when the power required has doubled to gain a noticeable increase in volume (DB). 2X the power output = +3 dB increase, 10X the power output = +10 dB increase, or twice as loud. So, what is the benefit of more power output?
To further understand the above please see this article.
Hopefully this will benefit everyone
The lesson is you don't need tons of power to be loud. A well thought out and designed sound system will be crystal clear and be plenty loud. Use common sense.
12s suck. 10's are the way to go. Another lesson here is that a well designed speaker will out do any over sized or over powered poorly made and designed speaker
Some of the best audio equipment around is made by companies people write off as junk. Just because its not kicker doesn't mean it can't kick.