Not at all.

I know it is not an easy choice, especially when the devices are not really cheap.
From this what you are saying I would go for a handheld rather than for a nuvi. When you are hiking in the mountains, the handhelds are easier to use, the battery last longer and can be replaced any time with a standard AA.
I am still a fun of the 60C/CSx but slowly getting more used to the Oregon series with touch screen. First I thought that the touch screen would be not good idea on the field, but such easy function like "lock the screen" with 2 touches solved the problem.
The size of the unit and lack of pointing antenna, like in the 60 series, makes it easy to carry in the side pockets. This is the unit I have with me in the same back with my laptop (always beside).
I miss some "one touch" functions like on the 60 series though. But maybe if I didn't use it before...

There maybe a bit more difficult to find some accessories for the Oregon than for the 60 CSx here in LOS, but we are here to help
Happy hunting
PS
If you would like to hold and feel both units (60CSx/Oregon) you are more than welcome to come and visit us

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gpspassion really rocks

, lots of information about the GPS