I think Staal gets massively overrated because of one huge season in 05-06. He scored over 100 pts that year. However since that time, he's in the 70-75 pt range.
That was the first year post lockout and PPs were through the roof. A lot of guys had career years. Joe Thornton had 130+ pts, which even for him is huge. Gionta had 48 goals. Gomez had his best ever season and became a 7million dollar centre as a result. Cheechoo went from 30 goals to 56. On and on down the list guys put up career years with extra PP time.
As I said the rest of his career he's a 70-75 pt guy or in that range.
While he's better than Plekanec, I don't think Staal is so much better that you add so much, I wouldn't move plek plus guys like Beaulieu, Weber, and draft picks to get him. He also makes nearly 3million more per year.
I'd love to get him, but not at the price proposed here, its too much.