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The 60CS looks like a good unit but I am really more interested in a rugged system with auto mapping.
what do you mean by rugged? we've dropped ours and it's fine. and, we have the city select maps and if you punch in an address it'll route you there. you can tell it if you're in a car or on foot and i'll take you on freeways or surface streets--handy since we have yamaha scooters that can't go on the freeway.
i just checked garmin.com and it says right on the 60 cs that it does "automatice route calculation". also, the 60 cs has the quad helix antenna, which is said to be better. also, i really like the 60 cs's button layout. i'm not a big fan of things with few buttons that are multifunction (like the rino).
if you have an outdoors store that allows you to return a gps without penalty you should try the vista and see if you like it. if not, return it and try something else.
the most important piece of geocaching equipment, besides a gps, will be a pen. there are tons of caches out there that are too small to put pens in to sign the log. one time i didn't have a pen, but did have my camera so i took a picture with me holding the cache and posted it for credit.
we have what we call the "schwag bag" which is what we carry pens, stampers (our signature item), travel bugs, and other assorted tradables around in. that way we have all we need ready to grab and go. (if you have a dog, put some poop bags in there too!)