The Nintendo DS is a great choice for preschoolers and kindergarten age children from age 4. There are some great dinosaur games for little kids available for the DS, but there's also a brilliant choice of dinosaur games available for older children. So while this console is more expensive than some alternatives, it will last a long time.
Go Diego Go! Great Dinosaur Rescue is a great game for little kids. It's based on te TV show and kids have to complete various mini games to reunite Maia the Maiasaura with her babies. The set includes a Diego Design neoprene case which makes a great gift and keeps your DS safe.
Scholastic's Digging for Dinosaurs is also available for the Nintendo DS. A great choice for kids who want to learn all about dinosaurs.
My older son's favorite color is red so he thinks it's wonderful that the Nintendo DS Lite comes in bright red!