Hi, I'm want to buy a 23" ACD to go with my dual 1.8. I was wondering if there are any big differences between the new (after the latest price drop two weeks ago), and the old metal case ACD? And what's the difference between the metal case and the plastic one? I heard somewhere that the responsetime is slower on the plastic one, and because I also do a bit of gaming, I don't want to see my mouse with a tail! Furthermore I do a bit of webdesign and this 23" would come in place of a 20" Apple Multiple Scan and 17" B&W monitor. Any advice??