I am far from an expert, but you don't say if this is to be your only lens...
Assuming it is, I would vote for the 28-200, for a couple of reasons. First, it is a wide-ranging zoom, which would be very versatile for lots of applications you might have. Second, based solely on the F-stop numbers at max, it seems to be about the fastest of the three you list.
I am not quite as finicky as many on this site about staying with pure Nikon lenses, but in this case it may not matter. Unless you have a shorter lens in addition to this 'choice' lens, you may want to go with the wide-zoom of the Tamron.
If it is not to be your only lens then the choices are a bit broader and subject to subjective opinions on brand-loyalty.
Hey, thanks for posting so quickly. Yes, I do have another lens, actually the 18-55 which was my kit lens on my d-40 and then I have a 50mm focal lens. So I do have other choices, but I just hate carrying 9,000 lens around trying to figure out which one I need or even which one would cover all my basis... Thanks for you answer..I appreciate it..Darlene
None of them will autofocus on the D40, but I'm pretty sure you're aware of that. If it were up to me, you've already got the wide to mid range covered with the 18-55 DX and the 50mm for low-light, so it would boil down to the Kiron or the Quantaray. I'd probably pick the Quantaray, as I think it would at least work with the light meter on the camera. I'd be uncertain of that ability on the Kiron.