I think fifa2000 must be more of a manager game like sensible soccer. Yeah I know that game is pretty old but it's (except for the graphics) one of the better manager games.
The laegue shouldn't be just one season but more and when you've made your team champion you should play in the Champions League the next season. Also the match between the European and South American champion must be in it + competitions between mational teams.
Also the transfer market mustn't be as easy as in fifa99. I think it's very strange that a club like Anorthosis can buy a player like Patrick Kluivert. Other thing: Players must get better if they play well. There are too many underrated players in fifa99. If a player scores about 25 goals in a season the player should get a higher transfer fee and the points a shooting, heading, passing should get better. Of course when a player plays worse it must be th eother way.