I reckon I can pick up a RDB for about a grand. I have fondled the Tavor a couple of time now and I would have to replace the trigger if I purchased one. I really disliked the trigger on it. So 1750.00 for a Tavor and 250-300 for the nice trigger. This is my math.
Many may be fine with the stock Tavor trigger, to each their own.
The RDB intrigues me more so than the Tavor now. I am no expert, but the design and operation of the RDB appears to have been ingeniously KISSed.