16:9 external display Lion

I just bought a new 27" iMac with Lion installed. I previously had the 2.19 ghz iMac running 10.5.8 and had an external LG W2040 16:9 display (optimal setting 1600x900 for resolution) and had no problem with it. I bought the thunderbolt mini display port adapter to run the VGA cable to my new machine and then ran into a hitch...
The new machine does not give me a 16:9 option for resolution settings and I could not seem to run across what might be an acceptable substitute that would work and not either lose a chunk of real estate on the sides of the second display or stretch out what I have on the screen to fit the widescreen. Is there a fix/solution? I did some googling and found others with this same issue, but I did not find any real answer. Am I screwed with this display and Lion? SHould I just get another display to use? If so, what do I look for that will be truly usable with this new computer?
Thanks in advance (I am not overly versed in video stuff, so please have mercy on me.)

You need to use a DisplayPort to DVI adapter and DVI cable instead of that analog VGA connection.
Mini DisplayPort to DVI Adapter - Apple Store (U.S.)

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