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Any suggestions for the type of reports you'd find useful ?

Nope, I'm afraid not. If I knew what reports would be useful, I'd probably make them myself.

I'd love to know how I rank for the keywords that bring me traffic, but I'm not sure if there is an easy way to get that from Google.

You can't get it from analytics, but if you signup for Google Webmaster Tools it'll tell you your keyword rankings.