What a topic YAY!!

Let me point out a few things though
Dimetrodon was not a dinosaur but a early ancestor to a series of reptiles that branched out into the Dinosaurs.
the Pteradactyl, was a flying reptile and not a dinosaur and belonged to the family of Pteranodons.
Pleseasaurus was a marine reptile and not a dinosaur
Archaeopteryx well thought to be the first bird was acctually a turning point in Dinosaur evolution, showing that dinosaurs had evolved into birds...The branch of dinosaurs that did this were the Ceolorusaurs.
Just to clear that up with some people, Dinosaurs were terrestrials only and did not fly nor swim. Their legs stood up right and where not sprawlers, wich legs come out from the side.
OK and now to the question my all time favorite dino is none other then The Tyrant Lizard King Tyrannosaurus Rex
I must say he has been my child hood hero..and something to really look up to literaly.
(any questions about dinos..im the man to talk to)
-Kai