I don't tend to download databases, but the three places I would check (based on reputation only) are:
The Official Forums - http://community.sigames.com - which is where most people involved in the community are registered and advertise their stuff. Especially look in the editors' section.
FM-Base -
http://www.fm-base.co.uk (which you're already familiar with)
Susie - http://www.sortitoutsi.net/ - which is one of the big, traditional sites with a lot of downloads.
There may be more, but they are the ones that immediately come to mind.