I am fond of the Ertl's and they are quite affordable but the detail is not all that impressive. The Spec Cast are more detailed but are also a lot more expensive. What I do like about the Spec Cast is the implements that usually go with many of the models. And those are quite impressive, quite detailed and that makes the price very reasonable.
Ertl 1948 Cub
Spec Cast '48 Cub with Planter