Gliese 710
[Many nearby stars will pass close to the Oort Cloud, but only one will move through it. Gliese 710, in 1.36 million years, will likely gravitationaly perturb millions of comets]
The above is from Astronomy Magazine's issue for April, 2006. The April issue is *all about stars* (get it while you can... great for students), but I thought that one was pretty interesting.
From APOD: Gliese 710
Of couse, our sun can begin it's expansion into a red giant before that.