Bill:
I think you have summed things up very well in your post at the bottom of page 1. Richie also hit the nail on the head when he said "horses for courses". I kind of understand what Burnie is getting at when he says "if you don't have a navigation background, then the 2610 might be more [suitable]...", though I might phrase Burnie's comment differently, I would probably put it this way: "If you don't need a whole raft of specialized navigation functions, then the 2610 is probably the best choice." I like to think I have a navigation background (I'm an aircraft pilot by profession), but after having used the 296 with all it's amazing navigation functions on my moto for a month, I'm darn glad to have my 2650 back - it's simpler and faster to use on the moto, and gives me more moto navigation power, without confusing me with a ton of features I don't want or need on my moto.
A critical issue that motorcycle users have to keep topmost in their mind when purchasing a GPSR is: "What do I actually want the thing to do for me?" I bet that if you ask that question to 5 different riders, you will get 5 different responses, which might mean that one rider might be happiest with a GPSMAP 60, another happiest with a SP 2610, and another happiest with a 276C.
This decision making process is easiest for those of us who have some years experience using GPSR's on motos, and have had the time to become thoroughly familiar with the capabilities of different units. It can be a very difficult decision making process - not unlike deciding what laptop or home computer system to buy - for someone buying their first GPSR.
At the risk of over-simplifying things, I suggest that riders who intend to do long distance touring - or mostly road riding - stick with the "pure automotive" units (SP III, SP 26xx), riders who plan to spend a lot of time off-road consider the less expensive "outdoor handhelds" that have the capability to store street maps and handle work with paper topo maps better (GPSMAP 60 or one of the higher end eTrex models), and only riders who have a significant need for marine or aviation functions consider getting a "primarily marine" (e.g. 276) or "primarily aviation" (296) GPSR.
There are, of course, lots of choices from manufacturers other than Garmin, but I am not familiar with these products, so I cannot reference them with any competence.
PanEuropean