Hi, I have a new model (1.5 ghz) 12" Powerbook. It has the GeForce 5200 Graphics card. Will this work with the apple 23" display? I went the apple store and they said that the 20" works better. I generally get the impression that they don't really know all that much there, so I'm appealing to you guys. Also, any comments on the 20" vs. the 23" would be appreciated. For instance, I'm not sure what exactly designates the 23" as HD, seeing that proportionately, the aspect ratio seems equal between the two. The apple store was not able to answer this question. Yikes. Thanks very much.