FAT Daddy, I'm in Anaheim and I got my rocks from Thompson http://www.thompsonbldg.com/ in Orange. I picked up ~130 lbs of 'Baja Cresta' rock for 12 cent a pound. Very good price. It's more than enough for my 75G tank. I got some pictures of how it looks like and closeup. Call them and ask if they got river rocks. Personally I'm not a fan of it because it's hard to stack.
+1 for the eggcrate.
thas a nice tank, is that background cement covered styrofoam?