My experience with having had the 7100, 7105, 7130, and 8700 is that I prefer to have bigger keys and the Suretype. I know that Suretype isn't perfect, but it does train well. I found that I could type faster on the 7100 series since a) the keys are bigger, and b) you don't have to move your thumbs as far between keys.
I agree with Pizzle though - you really have to test them all out and decide for yourself. And not for 15 minutes in the store - in my opinion you really have to take one home and make it part of your routine for a week or two to see how it fits. I'm planning (hopefully) to get an 8100 in two days - my only real concern is not that the key size will be too small (I think they will be close in size to the 7100's keys) but that the size of the device itself will be too small and difficult to hold and type comfortably. I do like small devices, but at some point (for me) if the device is too hard to hold and interact with then I'm less likely to use it often. (case in point - I really like the Sony Ericsson w810i I have - it does lots of cool stuff, plays music, takes great pictures, etc. - but it is actually too small for me to hold and operate comfortably, so I use it way less than my 7130c.)
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