I've tried a few virtual tabletops, and I personally think
Maptools is the best (certainly the best free one)
You can setup dice rolling macros (so once you setup the macros you can roll 1d6, 2d6, 3d6, 4d6, etc etc etc with one button)
(for something like wushu where your not totalling it you can setup a macro like
[1d6] : [1d6] : [1d6] : [1d6]
Which would show you each dice roll instead of adding them like just [4d6] would)
For games like Wushu where tactical movement isnt really a concern, you can just use the map area to show pictures setting up the scene. And for games like DnD where tactical movement is a concern then you can use it as a map with fog of war, vision, light etc.