Thanks everyone for your advice from the other post. I just spent the last hour investigation the leak. After several gallons of water I found the exact spot where the water is entering the cabin.
The water comes in exactly where those two pieces of plastic intersect (sorry, not sure what the terminology is, possibly the "sill."?)
Here is a closer view, does this help me determine exactly what needs to be replaced? At least now I know its not the sunroof. Thanks guys.