I use the PRS-600 and glare is very minor for me. I read outside a lot, and it's never been a problem outdoors. Indoors, it's simply fixed by tilting the device a little to the left or right.
Kobo is limited in format support, iirc.
The Touch is the most minimal in terms of keys. The Kobo's d-pad is bulky for my tastes.
And to counterpoint iandix, I found the nook's LCD much more distracting than the glare on my 600.
Ideally, you should go out and try the devices yourself!
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