Ask yourself what the actual purpose of the weapon for which you are purchasing the part. Another question worth asking "Will I feel bad if I wear the finish off an expensive part vs a cheaper part"? (and more importantly, will it functionally matter...)
I don't think there is any doubt about LaRue quality--its top notch. But if rendering that beautiful rail system into a scratched up mess is going to make you sick at a later date--then I'd think about something that isn't going to have that effect.
If your weapon is more of a tool than a bench piece--get the best tool you can afford to do the job and don't worry about the cosmetics.

