If I had the power to restore five dinosaurs to life, I'd pick:

Sauropods - I'd bring back a herd of them and place them in the African Congo, mostly because the ones there might like company...

Triceratops - I'd let several loose in the wilderness of the Pacific Northwest to mess with the Bigfoot hunters...

Hadrosaurs - I'd like to see a herd of them loose in the Florida Everglades

Pterosaurs - Technically, not dinos, but I'd put them in Texas just to freak out the ranchers

Plesiosaurs - Technically, not dinos, but I'd release a pack of them in the Gulf Stream off the East Coast of the USA to freak out the whalers...