Coming from the BlackBerry platform one year ago, I was rather dependent on a physical keyboard. Not ready to jump to Android although I followed it closely it was simply too young and limited. Now one year later I'm using a Droid X & Captivate.
For me the Holy Grail is a brilliant software keyboard called Swype. It converts the tapping movement on a hard glass screen, to gliding just one finger across the keys, in one move, to create one word per swipe. Easy to learn, especially if one goes to their web site & views the two minute tutorials, I could not be more impressed.
Fast, fun, and very accurate, I'll never go back to a physical keyboard again. A statement I never thought I'd make. Especially since I handle so much email from my phone.
In turn for me, the 4.0" display of the Captivate seems to be the sweet spot. Now when I use my iPhone 4 the display seems downright small.
Therefore when choosing amongst the models the OP listed you may find the Droid 2's keyboard mute.