Found this while reading up on my new D80. Compares performances of different lenses and different aperture sizes. http://www.wlcastleman.com/equip/reviews/d80/index.htm
That's a pretty interesting little page. I wish it had the 50mm f/1.4 on there, or maybe it did and I just didn't see it. I've found the 180mm is too long to shoot portraits with inside, but outside it is probably doable. That's a good page, I'll have to check that out in greater depth later. Thanks for the link.