I have one quick thought: If you want to go clamshell anyways, do it. It will no doubt be similar in specs to the 5500 but with a MUCH better screen/form factor. Plus, you can then get into the pdaXrom and other new things only available for the clamshells - you\'ll join the latest and greatest.
I wouldn\'t hesitate long enough to post if I were you, but that\'s b/c I want to go clamshell as well.