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If you have DRM free EPubs than they will work on any of the EPub e-readers. I have no idea if you have to register the e-readers in order to use all of the features. I know you have to register the Kindle to use collections but I do not know if that is true for any of the EPub readers.
I do know that the Nook has its hard drive partitioned so that the vast majority of its space is saved for books from Barnes and Noble. I think that there are ways of altering that but I would suggest checking in the Nook Forums for that info.
Personally, I would find the EReader that works best for you and then worry about format. If you have educational material and some of that is in PDF format, the Sony is probably the best ereader for you. It has the best PDF rep of any of the 6 inch devices, even then it is not great.
If you are in the US, check them all out at a Best Buy or a Target and see which one is most appealing to you. Converstion is easy enough that if that is a Kindle you won't be overly inconvienced. At least that you will know that you bought the device that you feel most comfortable with.
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