Bigger is always better. And the displays do get better from year to year (the 2011 Pannys got rid of the floating blacks and seem to have gotten rid of the rising blacks as well, both of which were an issue with the 20009 and 2010 Pannys, although only time will tell on the latter). Unless you are on a tight budget, IMO you're better off with the latest models (I recommend the VT30 if you want the best PQ or the ST30 if you want the best value, and stay away from the S30).