I have a Nokia 5800, N900, and now a T-Mobile HD2. My HD2 has been quite stable. My big concern is that the HTC is not as rugged as either of the Nokias. There's a lot of glass there.

However, I am still trying to get used to the capacitive screen, and I do not like it. No precision at all.

Of the 3, right now today, I consider the 5800 the best overall, and the easiest to carry. It is a year and a half old, and Nokia just released another firmware update last week for it! I was quite amazed at that.The only downside is it is Euro 3G so I only have Edge.