Actually, Price is subjective and not a good measure of a product. Strangely enough, similar products will function just as well or better than others at higher price points simply on the fact that you are paying more for some things that might not be necessary.
For instance, looking at iPhones as the classic example of similar products, but in some cases, like the iPhone 3G series, besides the memory differences, case design and probably processor, there isn't much functionality difference to iPhone or the iPhone 4 at a normal user perspective. Only those who hack and tweak their phones would really get more benefit from one of the different models over the other.
In the case of Droid phones, it is simply more of who will give you what you want. While I have not looked at how the other Droid phones will do, I am sticking with my stock Motorola Droid 1 cause of Google Navigation and how it is setup.