I am having the same issue, this common?I'm having a similar problem with my 97 200SX - if I put the window down, it won't come back up on it's own with the power window button. Behaves almost like the window is off-track - tries to bring it back up, but seems to push it into the back part of the window opening and gets stuck. If I manually pull the window forward, then hold my hand against it to keep it in that position, the power window button is successful in bringing the window up.
I did have regulator replaced (or as the dealer told me at the time, the solenoid) approximately 3 years ago, but can't now remember what that ran (for some reason about $250 sticks in my head, but not sure). Would be interested someone knows for sure what it runs.