Another happy Kindle user here. Not bothered with 3G, don't see the point, unless you are suddenly going to decide you desperately need a book whilst away from wifi. I VERY rarely buy Amazon Kindle books, most of mine are from Project Gutenberg, and some are converted from documents I've either created or converted using Calibre. I do also have the Kindle app on the phone (just big enough, its a Sony Xperia Z) and on the PC (definitely big enough, its a 26" monitor!) and also on the Nexus 7 tablet, which is only used if its a colour book such as a photography one.
I think the e-ink screen is brilliant, and way, way better than any tablet screen, and far more restful.
I still buy books, but thats because they are technical things with a high graphic content such as drawings of machinery, etc. My largest format book must be way larger than A3, a book about the Eiffel tower, full of drawings. The kindle is brilliant, but isn't for the "coffee table book" scenario, its for "reading books". I also use it for Govt documents I need to have with me, and for meeting minutes and agendas, converted using Calibre, again.