Any Hints/Tips for Creating a Test DB?

I have written a routine that creates random data in the sports2000 DB.  The goal is to create a DB that is somewhat real and that can be used for standardized DBA performance testing for D&L, idxbuild, etc...

What are some things you would expect to see in a realistic test DB?  Some things I have considered:

• All type II S.A.
• Most of the data in a handful of tables (3-4 out of 20ish in sports2000)
• What about random characters?  Effect on index internal compaction?
• What about string length?  Mix up long and short strings? Doesn't matter?
• Fill all the fields or some?  I am filling all the fields since I loop through _file and _field
• How big is big enough for a test DB?  My gut feeling is tens of gigs so that the dump and load and idxbuild times are in the hour-or-more range.  

All comments welcome.

Paul