Here are the two good reviews of Nokia E90. Just have a look at these and decide the nearly $850 phone matches your requirement and budget.
First review by stevelitchfield :
Second review by TechShout.com . Result 9.5/10 ( WOW )
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[...] of near $800 – $900 makes it a bit costly. A small preview of nokia E90 was posted long before with two video reviews of Nokia E90 some days back. It is also seen that it can support upto 8gb sandisk [...]