After reading all of these threads, my new 276C was delivered yesterday. Last night I, I loaded all of Idaho, Montana, Wyoming, Nevada, Utah, Colorado, Arizona and New Mexico City Select data onto 96MB of a 128MB card. The 256MB Garmin cards are about $104 now, but I don't know if I'll really be wanting one, I certainly don't need one for 99% of all my riding which is centered in the Rocky Mountain states. The screen is as nice as they say, it is easy to use, and I've already got it mounted on the GS with a RAM mount. I'm happier with buttons because that's what I'm used to. After my old Garmin GPS 12Map, this new one is intuitive. The auto-routing is nice, but just not necessary in the west.
In the past, I looked at a map the night before and mentally stored directions (turn east in Westbumfuck, Wy). I don't ride into cities (why would anyone?), so this 276C is probably overkill for what I need, but toys are about want, not need. Add me to the very happy 276C owners.