web designer looking for good CMS recommendation

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In the past all the sites I've worked on had custom built ASP/ASPX
content management consoles.  I am not a programmer, and naturally had
to contract one each time at great expense and time to have the wheel
recreated over and over.

Can anyone recommend a good, sensible CMS package for a web designer
that is relatively easy to integrate with a custom designed front-end,
runs on a shared server (not hosted by the CMS provider), and one that
has current SEO and general 2.0 best practices built in?

Thanks in advance.

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