I had a 9800 GTX in my rig as of last night, gave it to my parents for their new build (yes sooooo overkill) since their new parts just arrived, and put my new gtx 260 in. So far, I am absolutely loving it, far better than the 9800. I have the 216 shaders also btw.
You won't regret it.
BTW, I have a 24" @ 1920 x 1200 also.