Yes sir!...
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Most forum members have both, an eink device and a tablet. As a matter of fact, iPad+Kindle is one of the most populars. There is actually a thread that I created about it, best eink/tablet combo.
Most people combine because tablets are better and faster for some kind of publications, like magazines or PDFs. On my case, the iPad2 is big enough to display my computer books with cutting off any line or code. It is also an fantastic PDF reader with GoodReader app.
I woud not rely on a tablet as my main reader though, I always find myself going back to my Kindle, but if you can afford it, go for it and get whatever combo you like.
Happy reading!