Problem with HDMI - external display resolution (MacBook andSamsung HDTV)

I just bought a new MacBook, and I have used my Samsung HDTV (http://www.amazon.com/Samsung-LN-S2338W-widescreen-720p-HDTV/dp/B000G6300U) with my old MacBook for over a year. First I tried to connect the two using the Mini Display Port to VGA adapter, which wasn't recognized by the Samsung. Now i tried using the Mini Display Port-->DVI-->HDMI route. The problem I have is that, while all the resolutions show up as able to be used in the display preferences (all the way up to 1920 x 1080), when I click on any resolution for the Samsung that is over 1280x960, all windows and dialogue boxes displayed on the samsung screen are jumpy, shaky and hazy. Is there anything I can do to allow me to use my preferred resolution of 1600x900?

I'm no expert on this, but seeing as your TV has an actual resolution of 1280x720 (according to the link), I can't see how you'd get good results from anything higher than that.

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