There has to be an Iguanodon! It was the first species ever discovered and started the huge dinosaur hunt! Ok on with the actual list in no particular order
Stegosaurus
Ankylosaurus (or any of them bad asses with a sledgehammer on their tail)
Sauropods!! (Diplodocus, Camarasaurus, Mamenchisaurus, Brachiosaurus to name a few)
Prosauropods, because they preceded sauropods and were a compromise between size and mobility, kinda like SUV's
Something from ornithopoda, pachycephalopoda and cerapoda each (there just has to be a Triceratops everyone loves them)
Spinosaurus (the one with the sail on its back)
Coelophysis, Herrerasaurus, Ceratosaurus, Allosaurus
Tyrannosaurus and raptors (all kinds and all sizes)
Most of all, please don't mix the different eras! I don't wanna see a pack of coelophysis fight over a sauropod carcass with a tyrannosaurus.