i have a 2100 and a 1000. vx1000 has awesome colors and its used in like every skating video, i use mine for follow cams and up close shots with alot of movement.
and the 2100 has a more clear picture and the colors are still really good, but not quite as good as the 1000. and its wayyyyy good in the dark, its better for artsy creative shots.
if you have the money get the 2100 cause its newer and more versitile. but if you know your not gonna be filming in the dark then get a 1000 cause its the best!