The D90 has video. That's really all the justification you could need.
Of course, there is that rolling shutter, which is really annoying, but if you don't see it, good for you! It bothers me when I see people walking in a D90 video and they look like
flickering holograms! This is not in the dark - it happens in bright daylight too!
Rolling shutter happens because every frame is not exposed all at the same time, but scanned from top to bottom. So if you move fast from left to right within the one frame, you will be distorted diagonally.
The Canon 5D MkII has better video with an external audio jack. But it still has the rolling shutter. The D90 is manual focus only in video.
So should you jump now, or wait for Sony's new models to come out, and see how they do video? The A700 and A200 are due for replacement as both are nearly 18 months old.
When the A700 and A200 came out, those did not have Live View, while the earlier D300 and 40D had Live View. Sony came back with the A300/A350 and
its autofocus in Live View is a lot faster than any other camera using Contrast Detect AF, even the D90. So if you HAVE TO HAVE video NOW, go ahead...
Sony announced a new Exmor-R backlit sensor, which would be a lot cleaner at high ISO. So again, best to wait.
bro, you make me wanna cry...i just got my slr like last month only...
if the new image sensor is coming to those entry level dslr, i'll definitely kill myself...