Is it possible to weed out unwanted work contacts from Address Book based on date stamp?

I accidentally imported my work contacts into the address book. I now have over 1500 contacts and the thought of removing those manually is crazy. The Address Book app that comes with Snow Leopard isn't very flexible. I.e. it is impossible to sort contacts by date they were created/imported and delete a whole range. Using the finder I did locate the files based on a specific date that all the work contacts were imported and can sort the ".abcdp" files, however, simply moving those to trash does absolutely nothing, as the file recreates itself within the "Metadata" folder from the database that Address Book uses. I either need to find an alternative contact manager that will allow me to sort and delete at will or need to somehow delete/modify the database to no longer include the unwanted contacts. PLEASE HELP! :/