IMac 27" Video Output

I currently have an iMac 27" Intel Core 2 Duo model (November 2009) and whenever I connect to my HDTV via VGA I cannot set a resolution higher than 1600x1200 @ 60Hz.
I know the TV is capable of doing so. My MacBookPro 13" with the integrated Nvidia 9400m is capable of setting a resolution of 1920x1080 @ 60Hz.
I'm running 10.6.4 and have the ATI Radeon HD 4670. I've tried SwitchResX and whenever I attempt to create a custom resolution, I'm told the resolution may be invalid.
I'm looking for a solution so I may leave my 27" iMac connected to my HDTV on a somewhat permanent basis. Any help is appreciated.
Thank you.

seemein3d,
I don't know that I can answer your question, as I am currently researching video I/O capabilities for my own 27" iMac. But, I did notice something in your post that might help.
Your HDTV should have a multitude of inputs, but your trying to connect via VGA possibly because you are already using the rest for other devices?
I would suggest trying to connect using one of the digital connectors, HDMI, DVI, or even S-Video. Even the cheaper and/or smaller HDTVs usually have at least 2 HDMI inputs. If you are already using both, temporarily disconnect one of them, connect it to your iMac, and see if you can get it to display 1080.
I would love to have one of the experts weigh in on this one, as this is one of my video output questions. Thanks.

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