Since you want to scope it, an inline would be a good choice.
My experience with inlines is limited, but the most accurate I've owned was a Remington 700 stainless model. Sub 1" groups @ 100 yards consistantly! Next in line for accuracy was a T/C Omega, and it was a lot simpler to clean. I'm now shooting a Lyman Mustang and haven't really had time to play with it much yet. It seems to favor light bullets and heavier charges for good accuracy. To date a 250 grain Barnes Expander MZ and 100 grains of Pyrodex has been the best load I've tried.
I like the simplicity of the break-open action, but the pics recently posted of the Knight rolling block has me thinking I should look closer at it.