CRM for Accounting/Bookkeeping

I own a small business doing bookkeeping and payroll for other small businesses. I have a client list of about 50 and it is growing. I have been doing all my management through Excel and Intuit Quickbooks. I have looked into MethodCRM to integrate into my Quickbooks, but am not sure if it is a good option. What do you guys suggest for my small bookkeeping and payroll firm?