Quota sizes

All,

I just want to get a consensus of what others are using for email quotas. 
We are currently using email quotas for all of our users but I want to 
know if we are being to constrictive. I get calls daily wanting me to 
increase quotas, or the "can you compact my mail database?". I do have 
compact programs running nightly, but as most of you are aware.... users 
ignore the warnings, until they hit the wall of not being able to schedule 
new calendar items, or not being able to save to the sent folder etc...

What is a good standard database quota limit? I know there will always be 
exceptions to the rule but I need a starting point.

Thanks for any and all input.

Thanks,
Scott Reece
System Administrator
City of Bend
sreece@xxxxxxxxxxxxx
Office - 541-388-4426