Share 'Chocolate Drinking Machine Recommendations'

I thought this would be an easier search but I'm hitting a wall.  We'd like to start serving some drinking chocolate at area markets and as I search for a machine to keep warm and agitate our heart-stopping concoction all I am seeing is 900$ machines and $50 ones.  Is there no middleground?  Are the billete high end machines really worth it?  How fast do the cheapies break down? Have you gone thr…