a Do you want to go with Matt and I to the restaurant? b Do you want to go with Matt and me to the restaurant? Option (a) sounds better to me in speech, but I think (b) is right because isn't the test if you take out the other person (Matt) and say the sentence, it still has to make sense? So it would not be right to say "Do you want to go with I to the restaurant", it would be "Do you want to go with me to the restaurant". Anyways I figured someone here would have the definitive answer to clear it up.