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!"
except
supporting lenses without a motor in them. Right now the D80/
D200/etc support these lenses but I am thinking about jumping ship to Cannon or Sony due to lack of support for older lenses that can be had for a better price. Companies like Sigma and now Tamaron are now producing lenses that will work with the D40/D40X/D60, but not the ones that I want. Also bargin lenses like the 50mm f1.8 are not supported except in manual focus.
I do not want to purchace things two times.