With the nook, you can buy from pretty much any store out there except for Kindle, because the nook reads many formats. I don't know what other stores there are, but there are plenty out there.
If you want to spend more money, the ipad is a good choice too. A laptop might be harder to read on regularly, but that's up to you, and a cheaper tablet could also work.
I'm not sure about 3G on the nook colour, but I think most e-readers only use it for their bookstore. So, you can only browse the rest of the internet on wifi. There are hacks/roots available (such as one for the nook colour that makes it into something like a mini-tablet) but I'm still not sure if that opens the 3G up to browsing the internet.
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