The 0450 and 0480 are essentially the same.
The cheaper one has a plastic body and the dearer one has a metal body and one more power switch position.
I cant point you to a comparison but reports on the BCG450 suggest its not able to grind fine enough for espresso.
In which case it is not worth considering.
The two Sunbeams are the minimum quality Id recommend.
(I have a EM0450)