Seconded.
One plain vanilla phone on every carrier with every radio.
For all other phones: On starting the phone for the first time pop a dialog box:
Would you like to use plain vanilla android (with no enhancements for this particular device)?
OR
Would you like to use TouchWizSenseBlur a beautiful-finger-paint-like-buble-gum-super-duper-extras-which-will-love-you-all-night-long-and-cook-you-breakfast-in-the-morning-full-of-win-enhancements-for-your-personal-phone-and-life?
At the start of 2010 it looked like Google was going to try to go down this road with google.com/phone but then Verizon came calling and said "we don;t think so". Google got into bed with VZW on the issue of net neutrality for wireless networks and one of the victims was their project to change the way phones are bought and sold in the US. Perhaps Larry Page will revisit this in the future, but it's difficult to see how it fits into his "focusing" strategy. I'm not holding my breath that all this changes in the US any time soon.
And yes, I vote with my money. I bought an unlocked Nexus One through Google.com/phone on the very first day it went live and replaced it last month with an imported unlocked Galaxy Nexus GSM. And yes, it is a fine phone. When I showed it to the folks at the local Verizon store they were salivating. And then they offered to sell me cases and sleeves for it. They had those in stock, even if they still don't have a release date for the Verizon Galaxy Nexus phone itself.