Aragorn slide.
This article discusses who else was considered for the role of Aragorn in the LotR movies, you mentioned an interest in that:
Well that makes me sad in the pants. The only reason they replaced the perfect actor for the role is because he was too young and the same age as the hobbits? What in the name of Tom Bombadil?
Peter Jackson is an idiot who doesn't understand that Numenoreans, even in the third age, lived much longer than normal men. Hundreds of years, and hobbitses were lucky to reach 111. So Aragorn would have appeared younger for longer and would have been the perfect age compared to mere halflings.
So we got stuck with a SHORT, squeaky voiced, un-lordly, wimpy King who would have been better off NOT returning.
We Lord of the Rings fanatics understand these things, unlike Peter (late to the game) Jackson, who would have been better off sticking to bad King Kong remakes and eating Corsi style.