I would not be too terribly surprised if we put heavy things on the shelves. That's what we did before, after all. I figure I'll be buying myself some strength with the 1x4s, but I just wasn't sure whether to do toggle bolts into the studs or the sheetrock.

Then again, if it falls down, then I'll be able to practice drywalling and actually put up wood between the studs. Whee. Better the sheetrock rips out than the metal studs bend.
I am the Doctor, and THIS... is my SPOON!