For me, the nexus is the first phone I feel I will stick with for 2 years. I know when I got other phones I would be looking for the next best thing a week later. When I got the nexus this was not the case. Maybe it is because I do not want to have to root and all that to have the latest software or the fact that some phones with super specs still do not run as well as the nexus with "inferior specs" It doesn't matter how great the specs are when you have a skin that slows it down and takes away resources.
Same goes for me. After having my Nexus the past two and a half days, I can't believe I felt fine using my OG before, even when I'd been running CM7 for months. I always knew better hardware would make for a better experience but I never imagined just how great using the GN would be over the Droid.
I don't even feel like I'm gonna want to root this phone until Google stops supporting it - unless some sort of extremely better custom ROM comes along. I only started ROM'ing the OG Droid because I wanted to run Froyo once it came out; afterwards it was to crank as much usable performance as I could out of the sub-1 GHz single-core processor and 256MB of RAM. Now with 4x the RAM and essentially 4x the processor (1.2GHz dual-core vs. 600MHz single) I don't have any problems.
@CDEFG..., I'd say that if you're happy using your Droid X for the time being, are eager to get the most powerful thing you can, and don't have an upgrade on your line until March, the best choice would be to hold off til then. Even so you should definitely consider the Nexus for what it provides. Almost-entirely-direct-from-Google updates, very easy to flash custom firmware to (once you unlock the bootloader), newest and greatest Android...