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!"
Hawk, please read my post closer, talking about the data plans there. $40 vs $15 a month. Sprint doesn't have a comparable phone to the E62 (maybe the BB 7130e?) unless they get the Motorola Q. If you're thinking of the Treo 700's, Sprint's not far off from Verizon's price.