I'll leap in and take a bullet here.
I recommend the US Optics for the rings, as they tighten from both sides, allowing you to cener teh scope perfectly down the bore axis, Additionally, since they tighten from both sides you can overcome a set of off-center scope holes (on my PSS the holes are offset to the left by 25 thousandths - that will make you a crazy man until you figure that one out) and get the scope centered perfectly down the axis of the bore without having to use any windage from the scope to make it happen.
As far as a picatinny rail base goes, they are all good, all can or will give you 20 MOA slant for long-range work and multiple attachment points for the extra gizmos that I like to use - like a barrel cant level indicator (US Optics can give you 30 MOA if you are a real 1,000 yard plus hound)
I recommend the US Optics for the rings, as they tighten from both sides, allowing you to cener teh scope perfectly down the bore axis, Additionally, since they tighten from both sides you can overcome a set of off-center scope holes (on my PSS the holes are offset to the left by 25 thousandths - that will make you a crazy man until you figure that one out) and get the scope centered perfectly down the axis of the bore without having to use any windage from the scope to make it happen.
As far as a picatinny rail base goes, they are all good, all can or will give you 20 MOA slant for long-range work and multiple attachment points for the extra gizmos that I like to use - like a barrel cant level indicator (US Optics can give you 30 MOA if you are a real 1,000 yard plus hound)