Advice on Assistive Technology

Although we are making some improvements in M's life. We are still struggling with choices especially mealtime! He has the stubbornness of a toddler when it comes to eating what he wants. Thanks to his condition (pulls her out) he can't tell me what it is he wants. Process of elimination just isn't cutting the mustard anymore! SO.. with the help of some readers, fellow bloggers and google.. I'm off on a search of assistive technology.. I'm not sure where to start and financially just can't buy them all.. LOL So any tips are greatly appreciated. One of his teachers suggested the Big Mac but I'm thinking he may need something with choices or pictures.. I saw the Tap-to-Talk on The Autism Learning Felt and this looks like an option. He loves playing with my cell phone and has learned to manipulate the mp3 player I think this may be a good fit! PLEASE PLEASE PLEASE leave me your thoughts and ideas!!