I always thought (a bulked-up) Russell Crowe would’ve made a good Anakin. 6’0" might not be tall enough though.
Like earlier posts suggested, I imagined a tall, masculine, rugged alpha-male with dark features who also had some kindness in his face.
He would be a great warrior, a real adventurer, who was overall a good bloke, but who occasionally had a hot temper (but NOT whiny!).
An important part of the story would be him following old Obi Wan on some damn fool idealistic crusade, which, inexplicably, we did not get in the PT.