There is a one-year FREE student license for
Vectorworks, so that might help.
I was under the impression that
ESP-Vision was more expensive than
WYSIWYG.
Now the rest is coming from me, who has never used any visualization software other than my brain which can be at times quite soft, so take it for what you will. I have and do work with professionals who use this software all the time, for high profile corporate and awards shows, not
theatre.
WYSIWYG is the oldest and most mature, it's on what R21? Those I work with who can afford anything seem to prefer ESP-Vision.
PreLite Studios, which does nothing but pre-vis, uses Vision, as does
DigitalStageChicago.
I would also look into
Martin Show Designer, as a lower cost, but still workable alternative. Don't know anything about Capture, other than it's an up-and-comer.
Hope this helped a little.