2 GB Database Limit / Upgrade from 3.6

We have not upgraded from 3.6 to 4b3, primarily due to the issues brought up about the database. I am not certain it is really an issue, but on the surface, it is a little scary. Can someone explain how much space is used per history record? For a system with perhaps 200-300 devices with a couple services polled every minute, I would think this would not clog a normal database with proper indexing and whatnot, but am I wrong?

Any other suggestions for one considering the upgrade?

THANKS!!