I work for verizon wireless and I must say to you that the HTC Incredible is the best out of the 3 but it also depends on what you want because the features are pretty similiar. I would scratch out the Droid 2 because that phone doesn't really compare to the X and Incredible. I have had numerous Motorola phones and eventually the phone pretty much dies. We have already received the Motorola droid X back from customers and you can buy the phone used and it just came out! The Incredible has been out for 3 months before this phone and there are NO used available because people don't send this phone back. The only drawback to this phone is short battery life but they ALL have short battery life because of all the functions. Just download the App Killer and you will be fine.
So all in all I say go with the HTC Incredible but if you must have a big screen and don't really mind too much about motorola's reputation then go with the Droid X. Don't get the Droid 2 at all. (It's not a bad phone it's just old and the camera is only 5.2 megapixels) I also noticed on Verizon's website that it states the Incredible does not have VZ navigator. That needs to be updated because it now includes that due to the upgrade.