i would agree in most part with sean there, i think that once you know what you are gonna shoot, ie what type of cranes, dolly etc that you might require to make the shot look great, you then can start to take into consideration what type of equipment to use. I would be partial to the HDCam myself, i think its the future, 35mm and 16mm while they are great, are an aging technology, the future is bright, the future is digital!
its also worth noting, as adrian said above, it would work out cheapeer to do a 35mm transfer, taht way you can shoot piles of video tape without worrying about going over budget.