Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
Regarding Nokia 5800: it is really available only very limited and as proto device, but it is an amazing thing, a Nokia, but al lthe same a very unusual and very high tech one. We are going to port all our applications to be available with 5800, but are waiting for Nokia to release platform specific APIs.