I think that V3 is the best one so far. I think that there are a few too many effects for me to tell what the original renders are... I can see what looks like buildings in the back, but the forground image is too opaque or has too many effects over it. The Text is pretty nice, however I would suggest reconsidering the placement; it might look better if it was somehow vertically centered. Just work on bringing out the render, and you sig will be very good.