I really like my 276c, if I was shopping now I would probally get a 376c but after checking out the Zumo.
26xx/27xx series is popular but I've never tried them (I like the battery aspect of the 276/376/378 series).
Check the AutoNav2000 thread in the Vendors section, he gives good deals to forum members. :thumbsupsmileyanim: :thumbsupsmileyanim: :thumbsupsmileyanim:
I have the 276c (actually two of them) and certainly do not regret my decision. The highest resolution display from among units you would consider, sunlight readable. More than enough capacity for my needs. 15 hour battery operation (just in case). Marine mode. Large tracklog, mucho waypoints.
Agree with the 376 comments - specifically because it comes WITH the Garmin XM puck and in addition to music (not needed by me - I prefer my iPod) provides full weather support including doppler displays. The 378/478 have full continent maps on baord, which is another plus - again, not necessary for me.