Agreed, wireless-n only makes sense at the moment if your whole chain includes support for it otherwise it will just revert to g mode. Both cards mentioned should be backwards compatible and if you can get it, an a/b/g/n is a cover all solution that is a good idea if you are likely to be transporting your notebook between a lot of networks.
If you're buying a Dell make sure to build the system a few times, each with a different starting point price-wise so you get the best price.
Most widescreen monitors are 16:10, your card will have no trouble driving a monitor at this aspect ratio. 16:9 is really more of a TV thing. Have you tried updating your graphics drivers? If the monitor is still under warranty and the problem is bad enough it may just be easier to return the monitor for an exchange.
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