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acquire a finite number of signal periods

Hi DAQmx/LabView Experts,
 
I  have a signal (10Hz ...1 kHz) that is almost sinusoidal (i.e. only slightly distorted). I want to perform a finite acquisition (e.g. 1 MHz sample rate) to deliver me EXACTLY n periods of my "sinus".
 
The obvious strategy would be to first measure the signal frequency, then acquire enough samples to cover n+1 periods and use a loop around the LabVIEW software trigger function to count triggers from 1...n for me.... somehow I have a feeling that there must be a more elegant solution to this problem - any good ideas ?
 
Many thanks HU
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