Hmm, It depends on what your reading habits are.
If you need to read a lot of PDF's and RTF's (Rich Text Documents) the Sony is obviously the Best choice as it supports those file formats natively quiet well.
While Adobe DRM books can be bit of a pain to get on, its not that difficult,and with most EU book stores moving to support ePUb its quiet a future proof option.
Finally I find that the Sony Interface is quiet bit easier to use and much more intuative, but mileage may vary.
If however Dictionary support is a Must (and even if it is not, it can be quiet handy when you least expect it) and Native HTML Support (Though Basic) is needed then the Gen3 is definitely the best choice.
Its Mobipocket support is currently the best in the market and coupled with the ability to add any fonts you need for foreign language support its a very versatile device.
I'm not that sure about of the eSlick device, so I'm sure some one will chime in.
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