I teach at a high school and we have 36 iMacs (20 last generation white and 16 current generation aluminum). We only have 1 GB. We do Creative Suite, iMovie, and maybe Final Cut in the future. We are in an affluent area, so I am going to put feelers for parent donations. I am thinking of adding 2 GB module to every machine. Where would be the best place to purchase or recommend a donating parent to purchase?