For someone who doesn't like the N97 you sure spend a lot of time here...
Theres a ton os reasons to get an N series phone. Last year instead of the Pre you would have said Andriod...
The Pre at this time is all myth. Until it's released and in general availability it's as good as you want it to be, just like the Andriod G-1 was. OSs take a long time to mature. If the new "WebOS" is anything more than a thin veneer on palm os it will have some growing to do. The question with Palm is, can the company survive till then, or did that call is Pre because it's Pre-Bankrupcy.
So let's look at your list:
iPhone: crap camera and $~1000/year ATT plan, can't swap out the battery and you HAVE to use itunes.
OmniaHD: can't get it so who knows how well it will work. Does it reboot on the letter 'j' like the insight?
i7500: Maybe this one will last more than 4 hours on batt? more vapor.
Nokia certainly does have a huge strength in the US market. They sell and support unlocked US handset. Before you whine to me about EU handsets getting more firmware keep in mind not all EU product codes get them very quickly either. It's been 3 weeks since the v21 5800 fw and not even all of EU has it.