I've just been smitten with the Nikkor 180/2.8, owing to its seemingly unique "sweet spot" of quality, affordability, and size. There have been several versions of this lens, and I am wondering how much camera I would need to be able to be able to meter with the various vintages. I'm fairly sure that with my current D40, I'm limited to the AF versions if I want metering (and I do!), please correct me if I am mistaken. I understand that they wouldn't autofocus on my D40, I'm ok with that with the help of a KatzEye focusing screen. Looking forward, I've been considering a body upgrade to a used D200 or D90 for some of the other features they bring (mmmm, bracketing and AF motor), so I guess my question is, would either of these bodies meter with Ai lenses? Or Ai-S lenses? I'm just trying to build my upgrade plan to be able to take advantage of bargain lenses if possible. Any input would be much appreciated!