  We present here the model dependent and independent sensitivity studies for
NaI detectors designed to test the DAMA result, and compare the predicted
limits from SABRE with the present performance of both ANAIS and COSINE. We
find that the strongest discovery and exclusion limits are set by a detector
with the lowest background (assuming equal run times), and also note that our
method correctly computes the present exclusion limits previously published by
ANAIS and COSINE. In particular, with a target mass of 50 kg and background
rate of 0.36 cpd/kg/keV (after veto), SABRE will be able to exclude the DAMA
signal with 3$\sigma$ confidence or `discover' it with 5$\sigma$ confidence
within 2 years. This strongly motivates the quest for ever lower backgrounds in
NaI detectors.
