The best source of information on CRM's I know is at
www.garydavidhall.com His website has information on about 40 different CRM systems and has a comparison matrix so you can compare different systems.
A lot depends on what you expect your CRM to be able to do for you. Gary even has a powerpoint on that subject. Give yourself some time, the website has a ton of information.
Disclaimer - I'm just a satisfied customer and receive no compensation for referrals.
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Broker-Owner Thirteen Years REO Experience
GRI,CRS,CRB,e-Pro
Some days I feel like the bug, other days I feel like the windshield