Running Amp power lead

Ok, I'm going freaking nuts trying to figure out how to run the power lead from my battery through the firewall on my 2003 Explorer. I've been told that where the parking brake cable runs through would be a good place, but it is difficult to get through from both inside and outside the vehicle. Everything in the engine compartment is so crammed in there that I can't see a good place to run it. Does anyone have any ideas because I am becoming frustrated. Thanks!

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2004 BMW 325ci.
Alpine CDA-9885
JL 300/4 and 250/1
JL XR 5.25 comps
Infinity Kappa Perfect 12

I would consider what side your battery is on, in conjunction to where you are going to run your rca's. After deciding this, drill a hole, use a rubber gromet, and snake the your power cable through the hole while taped to a white plastic track found in antennas. coat hangers are a good last resort for pulling cable through, remember to tape it up well. 

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if I remember right there is a second gromet right below the gromet for the steering collum.

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place