Just took a look at specs for the VP181B. It has a 30ms response time, 350:1 contrast and 250 nits brightness. The VP171B has 16ms response, 500:1 contrast and 260 nits. The two monitors can be had for about the same price (maybe a little more for the 181) but the specs of the VP171B blow away the VP181B and I doubt if you would really notice the extra 1" of real estate.