I mentioned the number of pages in the post right above.
As for page density, no fixed number here you have to use your judgement. If you have a fill factor of 80% set, an avg page density of 75 is probably fine. On other tables 75% may be far too low.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability