Well, personally, I would just run to the store and get a large plastic bottle of juice, anything over two liters (I know they sell Hi-C in some pretty massive containers). Use that and just do intermittent shaking. Otherwise, go with one on the stir plate, and one shaking. Just run the numbers through Mr. Malty to make sure you're getting the right cell count, and I don't think it much matters how you get there.