Thanks for the compliments Mike!
I started with 45 pounds and added another 45 shortly after. The original LR was used the cycle the tank. The additional LR was cured in a large Rubbermaid trashcan. Both orders of LR came from the same online retailer, but not swf.com so I can't list the site.
I am currently using only a Fluval 304, but am considering removing the Fluval and using the powerheads, skimmer and LR for filtration. Like most other hobbyists I'm a little worried about "pulling the plug" and going without a traditional filter.
I would not recommend the SeaClone. Others on here have had success, but you'll hear more negative than positive. I had one and it sucked . . . so I returned it. I now have an AquaC Remora and LOVE IT! It is amazing how nasty the stuff is that my skimmer pulls out. I'd say your skimmer is one piece of equipment you don't want to be cheap with.
As for powerheads, I had been running only 2 AquaClear 70s (formerly known as 802s). I circled them in yellow. The left one creates a lot of surface waves along the back of the tank. The right one blows across the back and bottom, just high enough not to disrupt the sand.
Since the picture was taken, I've added an AquaClear 30 (formerly known as 301) in the top right corner which I circled in red. I was getting some film in the top front corner due to the way the water was circulating. This has helped. I also plan to add another AquaClear 30 behind the rockwork on the left, shown with an orange arrow.
To be perfectly honest, the AC 70s are too powerful and I don't have them at full blast. It would be better to have several moderate powerheads to prevent "dead spots" versus 2 hurricane force ones.
Good luck with your tank! Let me know if I can help out.