Dust inside brand new 70-200mm: Exchange or keep?

I am inspecting a new 70-200mm VRII and see a noticeable speck of dust behind the front element.  It is big enough for me to easily see it without even having to shine a flashlight down the lens.  I understand that dust will inevitably find its way into all lenses, but I do have the option of exchanging for a new one.  I don't have OCD, but I feel a bit of pain accepting a $2100 purchase knowing that it has imperfections on Day 1.

What would you guys do?