So, I bit the bullet and purchased the Kicker Powerstage Soundgate "kit" from www.shopgmcparts.com They had the lowest price that I was able to find and don't believe any of the BS from AutoAnything about pricematching... They don't do it. They try and use smoke and mirrors, but they fail.
Anyway, the install was easy. My strong suite is not reading directions, but the directions provided were actually clear and helpful. With the helpful information provided within this thread I was ready for the hard part of fishing the power wires through the firewall. That was the most difficult part. However, thanks to the other posters, I thought it went as simple as can be.
The install took about 2.5 hours, simply because it was cold out and I was in no hurry. Oh and somebody routed the cable to the sub woofer backwards. Remember, read the directions...
How does it sound? Frickin amazing. Far better than I expected. My own media is simply awesome, but what impressed me is what it did to XM. I wasn't sure how much it could help the compressed audio from outerspace, but it improves that 110% as well.
The best part about this way of doing things is everything is plug and play and you keep the factory look of the dash...
Andy